Cool, isn't it? I like watching their brains squirm trying to make sense of the logical disconnect.
But there isn't a logical disconnect. The hard left's objective is to disrupt and discredit existing societal and related institutional models and norms sufficiently to replace them with their version of paradise and they use whatever comes to hand. If they could turn things upside down by praising Israel and damning Islam, then that's what they'd do. The whole point is to create a vacuum by whatever means and then be the one to fill that vacuum. It's not about ideological consistency, it's about creating a revolutionary atmosphere where profound change is achievable because the status quo is hopelessly discredited.
One has to say that it's been a very successful strategy, helped in large parts by useless middle class liberal chumps who think that they can reasonably engage and compromise with people who are not interested in compromise but only in happily banking the slightest concession before coming back for more. Sadly these helpless liberal clowns are over-represented in the higher echelons of our most important institutions, including the armed forces.