If you see atrocities happening far away and feel helpless to do anything to stop them, you have to remember that capitalism and nationalism are global beasts. Weapons are probably made near you. Finance capital supports this, and they have offices in major cities. The politicians who send money and arms to such people have names and addresses.
You can't stop the bomb that's already falling, but you might be able to stop the next from ever arriving at some airbase.
As the saying goes: think global, act local.