Schindler saved a bunch of Jews. More than zero, which is what would have happened if all he said was "hang in there." It's not like your choice is between learning how to cope and trying to assassinate Hitler. There are many options in the middle, with varying levels of commitment required. Calling out bad behavior when you see it is one of them.
Because all of the other Germans who didn't agree with what was happening just accepted it and went along.
Are we done here?