Noted, committing adultery and then paying off a porn star is not as bad as Pete being in a loving committed relationship.
So I came up with another way to put this, that might be easier to understand.
Say two men joined the international Vegan Society, and both end up in management.
After working there for several years, Tim goes out to celebrate with some buddies. Who knows why, maybe their favorite team won the super bowl. So there they are drinking some good hooch, and then out comes the hot wings. Platters full of hot wings, and before Tim joined the international vegan society, he loved hot wings.
So he's sitting there, all his buddies are shoving hot wings at him, and he decide oh what the heck... and starts chowing down. Next you see a photo of Tim all over the internet with hot wings sticking out of his face.
On the other hand, there is Bob. Now Bob has never eaten meat in his entire life. He's invited to speak at a university, and stands up on the stage in front of a large crowd and says "yeah, we shouldn't eat meat. However it's fine if you do. It's not a big deal, but we would like to promote eating vegetables, but there is nothing wrong with eating meat now and then."
Now between Bob and Tim, which one did damage to the Vegan Society?
Was it Tim? Because he actually ate meat, and Bob did not.
No, it was actually Bob that damaged the Vegan Society. He directly undermined some of the fundamental values of the Vegan society.
Tim only violated the core doctrine of the Vegan Society. Bob, even though he didn't violate it, directly undermined the core doctrine of the Vegan Society.
Undermining the core moral values of Christianity is by far, much worse, than simply violating the core values of Christianity.
Again Paul was a murderer... but he repented. King David was an adulterer... but he repented.
Neither tried to fundamentally change the moral values, that they themselves violated.
Now as near as I can tell, Trump isn't very Repentant. I don't know for sure either way, but the Bible is clear what happens to someone who is not repentant of their sins.
However, between Trump and Pete, which one is directly trying to undermine the moral doctrine of Christianity?
Pete is. Pete is saying he is Gay, and a Christian, and that G-d accepts that. That is completely against Christian doctrine of moral values. Pete is a false profit, and is far more damaging than anything Trump is doing, by a wide margin.
That's why you see Christians rebuking, and calling out Pete. And rightly so.
Now if Trump comes out tomorrow, and says Jesus is fine with him banging porn stars, then I would be against Trump just as much. But that still wouldn't let Pete off the hook. It would just mean that now Pete and Trump are on the same level.