Then you aren't really decent at all!
I can get along with others without going to war. Even when I don't agree with them. In the absence of government, I'll not change into a monster. And I believe I have a good chance of fending off those rare pathetic losers who do.
I'm not that different from others, am I?
So why does everyone seem to always assume war, murder, and aggression are the default if there's not someone acting as a Big Parent to make them behave?
I think it tells a lot about a person if they believe that without a big bully making them behave, they'll go all "Lord of the Flies" or Mad Max on everyone around them.