Because they can; are you going to personally go out there and stop them. You can try however hard you want, if a country wants to go to war, war it will go to.
Well sure a country "can" go to war, I thought you meant that if a country just decides one day, "Hey, let's go to war with X nation," that they have every moral right to do so.
'Necessary evil to protect the freewill' 'imposing it's will on other states' Interesting. Do you actually understand what I said; you could have just asked for clarification.
You wrote that the purpose of war is a tool to impose your will onto other states. You think when France went against Nazi Germany in World War II, it was seeking to impose its own will on Germany? Imposing will is one purpose war can be used for.
Many nations view America as a bully towards the weaker, smaller, developing nations.
Many nations view America as the source of all the world's problems, doesn't make it so. I do not know of any "weak, small, developing nations" that the U.S. actively bullies. You want a bully, look to Russia and Eastern Europe.
The Americans of course do it in the name of democracy but do a lot of those people want to have democracy or do they just want to live in peace however it comes in their part of the world.
What peaceful, happy nations does America "bully" solely in the "name of democracy?"