Fact check: it was about 74 million people who voted Republican in the USA’s 2020 election. As with all votes, these can be broadly divided into categories:
1) the politician’s fanbase
2) people who aren’t enthusiastic about the politician, but are members of the party
3) people who aren’t members but generally agree with the party, and
4) people who don’t like the party but dislike the other party even more.
In the case of Trump, category 1 was numerous, loud and recognisable. But the other categories still outnumbered them considerably. His movement was not “considered extremely popular by about 80 million Americans”.
Secondly, let’s go with the theory that it was leftist agitators who smashed their way into the Capitol and everyone else followed. Seriously, let’s for a moment assume that this was the case (even though it wasn’t). The other people still followed! And the people who have been named so far are Trumpists. Ashli Babbitt, the bloke who sat at Pelosi’s desk, the bloke who hung off the balcony, him with the zip-ties, the poor fellow in the furry hat (who’s clearly mentally ill and needs some proper help rather than a massive prison sentence). All Trump supporters.
As for forgetting Trump? He’s not the President any more; time to move on. Professional trolls like Boebert and Greene are still fucking things up in Congress, and that the governmental fabric of the USA has been weakened enough that a more competent tyrant may have a go at establishing a dictatorship in a few years’ time. As @WhiteNoise said, let the USA remember Trump as something that can never be allowed to happen again.