If Donald Trump wanted Roy Moore to lose, Trump could have simply not endorsed the guy.
If Trump wanted Moore to win, Trump wouldn't have said Moore's rape allegations were credible. It does not matter if Trump endorses Moore if Trump also sabotages Moore.
And ofcourse Trump endorsed Moore, he would have pissed off his fan base if he hadn't done that, so Trump made his endorsement of Moore as backhandly & half-heartedly as he possibly could.
If Donald Trump wanted Roy Moore to lose, Trump could have simply not endorsed the guy.
If Trump wanted Moore to win, Trump wouldn't have said Moore's rape allegations were credible. It does not matter if Trump endorses Moore if Trump also sabotages Moore.