Here's my take on it:
If Tulsi Gabbard, Tucker Carlson, and Marjorie Taylor Greene are all vocally against something, it is because Russia is telling them to be against it. It's not because they give a shit what happens to America.
Presumably, Russia is against us attacking Iran because they like Iran and deal with them. They do significant good things for Russia and are one of the only friends they have left who can get shit done on their behalf.
This doesn't mean I think the US attacking Iran is a good thing. Just that it seems pretty likely to happen, and it's going to fuck things up for everyone, including the US, Russia, Iran, and Israel.
If Russia then decides to turn the very significant wing of the GOP that is Russian-corrupted against Trump, so that he's actually out on his own and has to succeed politically on his own merits or be destroyed, that may be a little bit of a silver lining to this whole catastrophe.