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Donald isn't going because he wasn't asked to give a eulogy and won't be the star of the show.
DING! We have a winner for best answer.
And besides, its hard to upstage the funeral of someone who has died. If he can't be the center of attention, there is nothing of interest for him.
Imagine him giving the eulogy. He might stay on script for a couple of minutes then, and I am serious, he would start ranting something about like "There was no collusion, Comey is a liar, Mueller is the head of the Deep State, rant, rant, rant....",