Most conservatives, as in all of those not in charge, have issues with empathy; specifically imagining the inner world of any other human being. That’s not to say that cannot do this very simple human activity, rather they specifically cannot imagine any other human on the planet thinks any differently or has any other motivations than them. Therefore if they would do something in a situation, then everyone in that situation must be trying to do the thing that they would do.
They believe democrats are weaponizing the justice system, because it’s what they would do, and thus they assume anyone that failed to do that before now was simply prevented from doing so – now that they see ‘weaponized’ justice happening, they think it’s fair game for their guys to do it.