The specific reason that AtheoLeftists cannot be persuaded by logic, by empirical data regarding the hundreds of millions callously killed by Leftism, or by the obvious failures of every socialist state to provide for its people, is that Leftism is a religion, fervently believed despite all evidence to the contrary. Today's evidence is Venezuela; ignoring that evidence are the millions of "free stuff" Bernie Sanders Leftists. It will never stop; it never has. The war will proceed forever and must always be fought, at every level - from local SJWs to Congressional, Supreme Court and bureaucratic proto-dictators. It is a perpetual civil war and no one is exempt."[T]he community of the left is a community of meaning, and is bound by ties that are fundamentally religious. For the non-religious, politics is the art of managing the possible. For the left, it is the path to social and personal redemption…For the left, politics is ultimately not about practical options on which reasonable people may reasonably differ. It is about moral choices that define us as human. It is about taking sides in a war that will decide the future of mankind… "Horowitz correctly observes that,
"Our century was a stage for the destructive drama of a secular religious faith called socialism, inspired by dreams of a social redemption that would be achieved by human agency, through the force of politics and the state." 
There is only one question: what tactics are required in order to prevail.