The way I look at it is the Republican voters who should be criticized in scalding fashion. In recent years the Republicans got elected wanting to do certain things but if you understand the system you knew that there were limits to what they could do because there was a Democrat President and at the very least a sufficient proportion of Democrats in the Senate to filibuster.The Republican establishment has taken for granted many conservative and moderate voters and these voters have gotten angrier and angrier. They've finally had enough of being ignored and it's their fault they voted for Trump?
So we came into this election season with a really good chance of having the Republicans FINALLY get into position to do some things. They have a number of really good potential general election Presidential candidates and if they pick a good one they could actually make gains in the House and the Senate. They can FINALLY do some of the things Republican voters want them to do!
But what happens? Republican voters pick about the WORST possible general election candidate available. They pick one that not even principled Republicans can support. AND they pick one that is likely to cause them to LOSE House and Senate seats.
It was a classic "snatching defeat from the jaws of victory" behavior.
Well, I guess you can't say that for sure until things play out and we see what happens. But that sure is what it looks like right now. Any reasonable analysis of the situation suggests that Republican voters just picked the worst possible available candidate they could have picked.