As a single individual, it's probably more effective to work on local ethical issues than to try to do something about global villainy. There are a few people in very special places and times who have the ability to make a global effect (Wikileaks comes to mind), but that's quite rare.

Yes, we can denounce villainy that occurs on the global stage. But in truth that's almost entirely virtue signaling. We look good, but there's no difference effected in the world.

Do something that makes a difference. Despising Churchill is useless, even if he deserved it (which is dubious).