They believed Trump would cheat, so they thought they would cheat before he got the chance to.

But what if Trump never intended to cheat?

I mean, even if he did, that wouldn't excuse them for cheating.

That's the whole mindset of the Left. They literally are so brainwashed that they believe they're up against pure evil and so they corrupt themselves in order to "fight back" but it's all in their heads and they become what they hate.