...at actually governing.
By creating and living within a propaganda bubble where facts and science do not apply, Republicans just need to create anxiety among their supporters to motivate them to vote. Of course, since their talking points are not based on facts and science, neither are their actual policy proposals. Indeed, policy itself is an after thought, because who cares about it, when all that matters is just blaming the Democrats.
Moreover, by sabotaging the Democratic process, Republicans no longer even need to be accountable to the larger electorate. Instead, Republicans can just focus on catering to a narrow band of society that is united by grievance toward their fellow Americans. It is a recipe for generating civil unrest. Of course, there is no incentive to actually making your constituents happy and satisfied, because happy people do not organize and vote. Instead, as Trump showed, even when Republicans hold all the levers of Government, the goal of Republicans is to continue to stir anxiety and hate, so that Republican supporters continuously feel under siege and hateful.
So, Republicans have developed a whole system for getting and maintaining political power even though their policies appeal to less and less of the electorate and are harmful overall. It is sort of like being a couch potato and eating junk food versus eating healthy and getting exercise. The former is easy and feels good in the short term, but is detrimental overall. The latter requires hard work and takes time to see results, but the results are positive if you put in the hard work.