Minato was Hokage during that time and a Hokage is supposed to protect the village at all costs. Also he and Kushina couldn't have known that their son would be treated that way. They thought he would be regarded as a hero because by turning into a Jinchuuriki he saved the village from further destruction. It's not like they could see in the future and see how their son would be treated. Maybe the Third Hokage should have been firmer and told the public to stop treating Naruto like a monster. The public shouldn't have been so narrowminded, but unfortunately they were - that's not Minato's or Kushina's fault. Their only mistake was believing in the goodness of the villagers and trusting them to be grateful towards Naruto.
Revenge doesn't settle issues cleanly. If anything it gives cause to more revenge. If A hurt B's family for example, B takes revenge on A. However the family of A would want to take revenge as well because one of their own suffered. So they attack B's family again. To which B will most certainly react against. And so the cycle of revenge will never stop. It will continue going on, creating more and more bloodshed until someone finally stops the madness. That is the truth of revenge: it doesn't settle any issues cleanly - if anything it creates more issues because when would the revenge taking stop?
My words are not taken out of a fairy tale - I'm just using common sense. Revenge never solved anything. Until someone stops the cycle, it only creates more problems because each party believes he's in the right to take revenge.
Like I said: while I understand why Sasuke would like to take revenge, it isn't the right course.
Once again you write a beutiful post. This says exactly what needs to be said.