Maybe. There's a lot of different types of people that use 4chan. Some of them are irredeemable, sure. Some are just disaffected people who've fallen through the cracks of society, yet are ripe for leftist radicalization, only needing to be exposed to the right ideas and have a push in the right direction. Although few would admit it, I would bet that many who identify with the "dirtbag left" now, were channers at some point in their lives.