History - including recent history - has done a marvelous job of showing us that hawkish =/= right wing, and dovish =/= left wing.
Exactly. Foreign policy operates on a political plane almost completely divorced from domestic politics - you have people of all political stripes being nationalists/internationalists or isolationists/interventionists.
Actual progressives aren't crazy hawks.
'Actual' progressives also aren't crazy doves. Isolationist 'progressivism in one country' is just another face of nationalism and makes one little morally better than the far right - just drawing the line of who gets to count as a person slightly differently.
Not being a crazy hawk doesn't imply that one is an isolationist. Tulsi Gabbard and Bernie Sanders aren't some pacifist isolationists. They just don't support our foreign policy that has created ISIS.