Go with Trump’s endorsement. If not, why not?
Because Trump is game playing knowing how it will come out. GOP defects and opposes Trump. Trump still backs their candidate. Their candidate loses. It's on them, not Trump, and Trump can point out that the problem isn't him, it's that they are a bunch of losers.
Strange dropped an investigation into the then Governor of AL. Then the Governor appointed Strange as interim Senator. People didn’t like that. Strange was the State Attorney General at the time. Plus Moore is a well known conservative who never has been afraid of a fight.