Well let's explain it to you and make it clear. Reason why some techniques were, are and will be labeled as Forbidden techniques is because they may took great toll on user, by the user ,it means normal/casual/average shinobi can't use these techniques without big negatives effects affecting his body or mind or both.
The reason why Orochimaru was expeled from Hidden leaves village by Hiruzen is because He was using Forbidden techniques(Yes not just learning and becoming stronger) without any important reason which could allow/push him to use it. These Important reasons could be protection of village..., standing in defence of weaker people, protecting your comrades or close ones. Moreover Orochimaru commited unforgivable actions for example by kidnapping children and later even shinobi for evil purpouses to improve his use of forbidden techinique.
The last reason could be that in Hidden leaves village most people are believers in great values as Honor, Protection of Life, Protection of children with personal immunity etc., so Orochimaru simply broke these rules by experimenting on children and even through his own village.
Sometimes some forbidden techniques can be contradictory with morals, which are natural to people as the greatest values which People are preaching about and caring a lot
Also the most people are right about Forbidden techniques being usable without any great reason only by Hokages and S- rank shinobi but even then they shouldn't be oversused unless you are not suffering any negative effects.
Now, let's me prove my thoughts basing on these examples:
1) The Fourth Hokage was using Shiki Fujin against Kyuubi - Reason: Protection of village and people
2) The Second Hokage invented Edo Tensei - Reason: Unknown for now... but most likely to bring Izuna, his brother Itama or other people who died in The war. There is also possiblity that Tobirama did to save a lot of shinobi from death by using dead ones already.... but still this technique need living sacrifice, so can only be used in extreme situation as war it seems.
3) The Third Hokage was using Shiki Fujin against Orochimaru- Reason: Protection of village and people
4) Multi Shadow clones technique is only labeled as Forbidden due to requiring a lot of chakra from the user which the most of average shinobi lack and can die fast... only a few thanks to big amount of chakra can handle such techniques.
etc.
Naruto may be expection.... but even he used his techniques to protect his friends/village and the world.
Summary:
The reason why Orochimaru was expeled from Hidden leaves village by Hiruzen is because He was using Forbidden techniques(Yes not just learning and becoming stronger) without any important reason which could allow/push him to use it. These Important reasons could be protection of village..., standing in defence of weaker people, protecting your comrades or close ones. Moreover Orochimaru commited unforgivable actions for example by kidnapping children and later even shinobi for evil purpouses to improve his use of forbidden techinique.
The last reason could be that in Hidden leaves village most people are believers in great values as Honor, Protection of Life, Protection of children with personal immunity etc., so Orochimaru simply broke these rules by experimenting on children and even through his own village.
Sometimes some forbidden techniques can be contradictory with morals, which are natural to people as the greatest values which People are preaching about and caring a lot
Also the most people are right about Forbidden techniques being usable without any great reason only by Hokages and S- rank shinobi but even then they shouldn't be oversused unless you are not suffering any negative effects.
Now, let's me prove my thoughts basing on these examples:
1) The Fourth Hokage was using Shiki Fujin against Kyuubi - Reason: Protection of village and people
2) The Second Hokage invented Edo Tensei - Reason: Unknown for now... but most likely to bring Izuna, his brother Itama or other people who died in The war. There is also possiblity that Tobirama did to save a lot of shinobi from death by using dead ones already.... but still this technique need living sacrifice, so can only be used in extreme situation as war it seems.
3) The Third Hokage was using Shiki Fujin against Orochimaru- Reason: Protection of village and people
4) Multi Shadow clones technique is only labeled as Forbidden due to requiring a lot of chakra from the user which the most of average shinobi lack and can die fast... only a few thanks to big amount of chakra can handle such techniques.
etc.
Naruto may be expection.... but even he used his techniques to protect his friends/village and the world.
Summary:
- Techniques labeled as Forbidden are reffering to average shinobi abilities/capabilites. Basing on The most of shinobi(average) Techniques are labeled as Forbidden due to taking great toll on user's body or mind or both.
- Techniques labeled as Forbidden can only be used by shinobi in life and death situation, protecting your comrades or close to you people, preventing big harm for your people, Protection of village etc., they can't be used without the reason.
- The reasons why some techniques are labeled as Forbidden is due to them breaking great values as: Honor, Protection of Life, Protection of children with personal immunity etc. as the most people are believers of such values.
- These Forbidden techniques stop being forbidden to some S-rank shinobi and Kages when they can use them without suffering any danger threatining life wounds or danger of death.
- Only a few skillfull or with special body, mind or both capabilities can use techniques labeled as Forbidden without suffering from bad side effects. However The most population of shinobi are average so These rules are applied to them and it make sense as there are always some expections from certain rules.
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