Depends on what you mean by 'intervention'. If you mean in its broadest, most literal sense, the answer would be 'people with brains', though if you mean wanting to go ahead and nuke Iran I suspect it'll mostly be the same sort of economically-stagnant, low educated, small-town nationalists who are behind most bad foreign policy because they use the machismo of the country as a proxy for self-worth.
Also, one very important point that I think is missed on a lot of Americans - US intervention abroad is not opposed by people in these countries anywhere near as much as some will have you believe. I wonder how many of the "not our problem" non-interventionists have actually talked to someone from a country where the US has intervened post-Cold War and conveying their opinion, and how many are just trying to use their position as a privileged white person to put words in their mouth and speak on their behalf about why they should pull themselves up by their bootstraps and fix their own problems.
Extremely true.
