Why do some people not believe the story that it was a staffer behind Donald Trump account who posted the video of the Obamas as apes?

I know this topic is a little old but I was just curious.

There are people out there who are saying it was Donald Trump and the staffer explanation story is a fib.

Why do some people not believe the story that it was a staffer behind Donald Trump account who posted the video of the Obamas as apes?
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