Oh yeah, not saying he's doing this out of the kindness of his heart.
McConnell does have a killer political instinct, which other Republicans (notably Mike Pence, after failing to invoke the 25th and the opportunity to position himself as a "national hero" in spite of the deafening calls to do so) quite evidently lack.
He and any Senate Republicans with presidential ambitions ought to relish this opportunity to clear a 2024 rival from the field. Voting to convict Trump would be the best way to whitewash themselves from the Capitol Hill riots and their last 4 years of complicity in all the Trump scandals we know about, and more intriguingly, those scandals we don't yet know about.
Perhaps naked GOP partisan interest and the national interest will coincide, just this once.