> Do they think they'll just win all the future elections?

There's a degree of that. But really it's learned behavior; MAGA literally sacked the Capitol in a violent insurrection and Democrats managed to botch the response to that. The only reason we're talking about future malfeasance is because Democrats didn't punish past malfeasance, thereby shifting the Overton window. And of course this goes back further than Jan 6 -- Trump might actually get a pardon from the next Democratic president if history repeats.