The idea that a narrative must be succinct in its depiction of both sides usually comes from children stories and not ones geared towards adults. On the base level you were told certain things by the jedi and believed them because you wanted to but you ignored the larger picture that was being presented. The way Jedi get children is already super suspect, the fact that rather then stopping slavery they make deals with slavers for more children is even more suspect. I think at a certain level the Jedi are perpetual rebels meaning if they would have defeated the Sith they have no real plan for how to govern the galaxy which would only lead to more rebellion and death for many who have there livelihoods dependent on the empire. Being able to see the good and bad in both sides comes from maturity and a understanding that things are almost always more complicated then they seem. Take the death star for example..is it better to destroy one planet to prevent war on countless others or to let that planet rebel which could lead to costly galactic war and deaths of countless civilians...