The entire ecosystem of the GOP is designed to reward bomb throwing. The way you get ahead in the party is not by working hard and following orders, but by saying outrageous things about Democrats and the establishment–including some Republicans–on Fox News and the internet. It is a system that works well when the GOP is in opposition, and powerless.
But what happens when the GOP is actually in power? How can you plausibly run against the establishment when you’re it? How does throwing bombs help you create an effective working majority that actually runs the federal government?
Hence, the many failures of the Trump years.