People can “feel” how ever they want. But when those feelings bring them to telling others to “not punch a Nazi” (symbolically here), in that moment, they are just defending a Nazi from the consequences of their actions and denying justice to victims.

I agree with this fully, though. But nobody here has said not to punch nazis, just told they feel bad about it (figuratively).

My pont is: if you are a soldier on a war front, you do not have to hate the enemy, or their leader, or anyone, to shoot them. You just have to know they will kill you, your family, and destroy your culture, if you do not. Telling people they should feel only pure hatred towards monstrous people seems reasonable, since you are correct they do not share the compassion nor deserve it - but it is not a requirement for fighting against evil. If you cannot hold a steady hand, even knowing faltering will kill your loved ones, kids in gaza, countless other victims or cause some other horrendous thing, you have to find the resolve in you, to do it anyway. But that resolve does not require hatred, it can be even just the love for someone else. If you punch a nazi, the emotion driving your resolve does not matter. What matters is doing it, even if you feel that empathy, because you believe what you are defending, is worth it.