It might take some time and it might be difficult

It’s been over a decade and they’ve had mountains of facts dumped on them and it hasn’t moved the needle. The only thing that’s changing them is if they end up being personally affected by their own actions. And even then, they tend to just default to blaming liberals/democrats for their self-induced problems.

they are still human at the core

And? Plenty of irredeemably evil humans have existing throughout human history.