The US civil war was a good thing. The American Revolution was a good thing. Bangladesh’s independence war, the revolution that created the Portuguese Republic, the Finnish civil war, the Turkish war of independence, etc. Lots of democracies exist today because of people with guns.

The US civil war was a good thing? It was better than the extension of slavery through the whole country, it was better than secession, and emancipation was certainly a good thing. But it was massively destructive--look up Lincoln's letters giving the cost of war as against the cost of compensating slaveowners in return for emancipation.

Turkish war of independence from whom? Are you referring to the Balkan wars of independence from the Ottoman Empire?

Yes, the civil war was a good thing. The destruction was a necessary component of avoiding those things which you acknowledge would be worse. That’s how the world works. Sometimes you need to avoid the bad thing through a lot of destruction.