Apart from the funding and inflation aspect anything that promotes internationalisation may help prevent war. It would be silly for America to have a civil war these days for example, with increasing internationalisation war between countries might also become inconceivable. Bitcoin is an international currency so it may promote internationalisation and reduce war. Maybe
I think you guys have it slightly backwards IMO. You are sort of claiming fiat funds wars which directly causes them. I would claim wars are caused mostly by religion and fiat is pumped out in efforts to get a leg up and produce more weapons/soldiers etc.
So if BTC were to replace everything, they would just pump BTC into the war to fund it.