Trump was impeached for being a sort of person absolutely abhorrent to his political enemies. He was impeached for the same reason that people said prior to his election that he was not fit for office. The list of his character flaws is too long to put in to this post, but all of them are the reason he was impeached.
Everybody knows that whatever political/legal/constitutional grounds were put forth were only the excuse for the impeachment. This is like when your child says he can’t study for tomorrow’s test because it’s already bedtime.
This is not a comment on his suitability for office, merely stating the obvious about the impeachment.