Jonathan Chait thinks a lot of prominent Republicans, including many who voted to acquit Donald J. Trump in the Senate, want to see him prosecuted. I think so too. I have as low an opinion of Mitch McConnell as anyone but you have to give the man this: He knows how to play politics and he has his finger on the pulse of his party. His after-the-impeachment-vote remarks seemed intended to incite not a riot but some serious prosecution of a president who is no longer protected by his office.
Trump has a lot of legal problems ahead. Chait lists some and here's a list from Politifact. I know some folks who say, "Oh, he never gets nailed for his crimes" but not that long ago, these same people were saying, "Oh, he never loses elections."
So clever of Mitch to delay the impeachment trial until after Trump was outta office so Senate Republicans could have it as close to both ways as possible. They didn't have to face the wrath of Trump-lovers by voting to boot him out but they could vote with him but say, "It's just because he's already out of office." Either way, it comes down to wanting to get rid of Trump but to keep as many of his supporters as they can.
And here's a real long article by George Conway all about prosecuting Trump.