Reagan was a horrible President, and we never get Trump without the Republican corruption that followed from that time. Newt and the 94 Congress perfected their Party acting only in bad faith, and the groundwork for that was laid during the Reagan years. That bad faith acting is why we have Trump now.
But.....Trump is the worst President in my lifetime. He literally tried to overthrow the duly elected government and keep himself installed in power. Even leaving aside the details of the two fully justified impeachments, the constant lying, the years and years of corruption (even before he sought political office) and the 91 indictments-what worse sin can there be against a democracy than to try to install oneself as President after the voters have told you to leave?
I really think that certain corners of the far right normalize 1/6 so much that a lot of people still aren't getting just how big a deal this is. If Trump had succeeded on 1/6-and he came very close to doing so-the democracy that has been the basis of this country for almost 250 years would have been over. Once a clear election result is overturned, that is the ballgame.
I am aware there are Presidents who have committed bigger atrocities in history. I think figuring out where they rank can be an instructive exercise, but I like to restrict myself to Presidents in my lifetime when I think about this.
In my lifetime, Trump has been the worst and it isn't particularly close. Because, while Reagan and GWB were terrible and did awful things (and Clinton did some very bad stuff too), no President since I have been alive has actively tried to let our system of government burn for his own gain. Trump did. That puts him on a whole other level.
An opinion does not turn into a fact simply because the person holding it feels strongly about it.