Because they are denizens of the Swamp, just like the Democrats. Attention Republicans: Stop Scapegoating Others for Your Own Personal Failures.
This is one of those posts where I want to quote the whole thing. It is wide ranging and but it comes down to why the GOP establishment is so completely out of touch with the people who voted for the GOP candidate.
The people who ran the Republican Party into the toilet — the people who were part of the Bush/McCain/Romney money train — don’t want to accept responsibility for their failure, and so they blame the 63 million Americans who voted for Trump
But seriously, go read the whole thing.