If you can't see the difference between the Bush presidents and Reagan and Trump, I can't help you. It's like saying Bill Clinton is the same as Bernie Sanders because they both support healthcare reform.
McCain and Romney lost because they went up against the Obama juggernaut.
2016 was different. There was a segment of the population that was ready for a demagogue and flocked to Trump. They carried him through the nomination and turned out in large enough numbers to put him in the White House.
I'm ready for things to swing back from extremism towards more moderate politics. Guys like Bush 41 and Bill Clinton would never be able to get their party's nomination right now as they were way too centerist.