They did have solid evidence to impeach Trump. He's been impeached.
Impeachment is a tricky matter because the articles of impeachment did not cite a particular crime that Trump committed which takes away from the objectivity of the charges.
Your personal opinion on the matter does not change the reality of the situation, which is that Trump has been impeached.
https://www.congress.gov/bill/116th-congress/house-resolution/755/textResolved, That Donald John Trump, President of the United States, is impeached for high crimes and misdemeanors...
The particular "high crimes" were Abuse of Power and Obstruction of Congress. You can read the whole text if you'd like to understand more.
Of course nobody can force anybody to understand anything that runs against their personal beliefs. That behavior pretty much defines the P&S section of the forum, so I'm not going to attempt to change your mind on the issue.