Why is everyone pretending that Trump didn't order a hit on Yovanovich?
I don't think 'everyone' is. It's just that his defenders gang is screaming the loudest. As usual.
The thing is, an ambassador can be recalled by a POTUS for no reason at all. They serve at the 'pleasure' of the president. He could have simply quietly recalled her and replaced her with someone 'more to his liking' and no one would really have thought a thing about it.
It all goes back to Scrotus' never wanting to do his own dirty work, even if that dirty work isn't really dirty in the illegal/unethical sense, but just unpleasant. It's been his modus operandi for decades. Let someone else take the blame. And that's because he's so very careful not to get his own fingers dirty so nothing can be pinned on him directly.
And because he's a coward.