But I don't care about you. I care about winning elections.

You seem already convinced, which makes you irrelevant. It's about building a mass movement that is zealously on board. Even if you were lost to the cause, that'd be a good move if ten people came in to replace you.

So what is it? Is hate "far easier to get people on side", or is it a fruitless "shallow thing"? Either way it's been incompetently mismanaged by leftist movements, with fascist extremists successfully leveraging it to excite and engage voters, and younger ones especially, while left-wing parties languish.