Anybody who hates America and Israel more than they hate Islamofascists are influenced by Satan. Simple as that.
Nah, no need to anthropomorphize this. It's the totalitarian impulse, pure & simple. Some people just gravitate towards a framework based on dominance & submission. For a century in the West, it was expressed in secular Marxism. Now that Marxism has died of exhaustion, many leftists feel a strange, inexplicable pull towards the one remaining moral system left that's based on dominance & submission.
IMO the lesson is that for leftists, it's not the secularism that they're fundamentally drawn to. It's the slavery.