Rhetoric like this only divides the left further.
Liberals aren't left, and the democratic party served its purpose to a T. These people who continue to defend it are too. Both of their purpose is to shift the overton window all the way in to fascism, which they are doing successfully, and have no reason to stop (until the fascist come for them, at which point they will wonder why no one is interested in or even around to help them).
But those doing the blaming (E: liberals) aren't on the left, and those who are on the left who wouldn't vote for a liberal have no reason to be divided by a lib licking a boot. Libs might be dividing themselves, those who now see through the bullshit will move further to the left, and those who buy in to it will continue moving along with them to the right.