If you don't have a tape recorder showing Trump saying "Fire Shira, I don't like what she did and she needs to get out" then you are making assumptions both for his reasons and his involvement. No one has that tape. Which means any claims that this is what happening is entirely speculation. We've seen a decade of people claiming these assumptions as fact, and it's really tiresome.

It's not related to copyright. It is an example of your hypothetical standard required to attribute something to Trump. My point is that even when he is on camera saying something, that does not prevent the post facto rationalizations. Even if he was on tape firing this person, people would rationalize this away too.