You nailed it. That's the reason, we will ALWAYS have the Left. The only ideology that is capable of growing and corrupting over decades, is leftist ideology. Centrists, Conserv and Libert. don't have that kind of long term collective organization. Or at least, those ones get corrupted by the Left too - just look at the ACLU

As you point out, the only saving grace is that Left is so inefficient and corrupt that they end up killing the host they parasitize. CCP gonna die... its a question of when, as will every other non free markets.