LOL, just to remind you:
Ninjas ARE NOT MURDERERS/SOLDIERS! Ninjas are MERCENERIES WHO DO DIFFERENT KIND OF MISSIONS FROM GARDENING TO SPY!
Further, in the ancient china and japan they were used as the emperor's agency and special cops.
Also, training kids to learn protect themselves and peace is not a failure but a clever foresee againts future evils who would once rise up.
In Kinnikuman, after Suguru and his friends achived peace they stopped teaching future generations and 25-30 years later they and mankind were almost killed off because of this stupidity because when some young and fresh criminals attacked after 30 years later there was no future generation to maintain peace!
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So as you can see:
1.Ninjas are not murderers who only murdering and sabotaging, but mercenaries who do any kind of job, even "cute ones" like Naruto and Team Seven did before the Chunin Exam.
2.Ninjas are also used as the police and agents of emperors and even countries.
3.Criminals will always exist and this is something that peace can't change. Police is needed to deal with them.
4.Fact: It was not the "village system" that was wrong, but the Shimura Danzo like rotten people who purposly misused the system to their advantage. With
Naruto they gone.
5.You don't even know what will be the short mini-series, so where the hell do you think that there would be antagonist there and if there will be why do you think not just some small criminal who suffer from steal-maniac?