No, they are like groupies or jock sniffers. They get an erotic high out of imagining slaughtering their enemies and feeling morally justified for doing so. Remember after the San Bernardino massacre the leftist media keep asking what the victims did to cause the shooting.
No doubt. Progs envy Moslems in this regard, and they live vicariously through their atrocities. But their bedfellowship runs deeper than that -- they both have a reflexive aversion to individualism, liberty, responsibility, and Israel. ...among other things. Natural allies.