As to why we need peacekeeping forces, it's easier, cheaper and more efficient than allowing things to get so out of hand they end up here. Or do you like having all the worlds refugees seeking asylum here? That's what happens when people can't live in their own countries, and we accept them. How about approaching problems in a more cost effective manner.
As far as refugees, I have seen no decrease in spite of our desire to be the sugar daddy of every dictatorship who backs us in our adventures. You seem to have forgotten the adage that so many have been told from years past: "Charity begins at home". It seems to please you that: "Charity begins overseas so I can fill my pockets with money extracted from the living standards of my country". It isn't treason but it isn't commendable either.