So we should never fight against evil, because some of the wars in the past caused more harm than good? That does not make sense.

For every "war on terror", I can point to WW2, Korean War, First Gulf War, Intervention in Serbia, where the good guys won and the world is better for it.

You are the propagandized one. Russia wants you to not resist their imperialism, just because the west made some mistakes in the past. You have fallen for their manipulation strategy hook, line, and sinker.