Yes, if conflicts threaten to engulf allies and U.S. interests. Yes, to protect human rights, support democracy. U.S. should give U.N. responsibility for providing relief and keeping the peace. It's the moral thing to do. It is a historic chance to advance democracy.
Domestic needs are most urgent.
U.S. has no enemies and should not pay for world's defense. U.S. must define interests narrowly, do no more. U.S. can't solve the world's problems. The threat of chaos is real. We can prevent chaos by intervening early.