Sometimes it's useful to think, "what if Trump was doing this?" Or if that's too psychotic, "what if George W. Bush was?" How would you react?
I'm cautiously optimistic about Omicron (if I were Nate Silver I'd call this MY PRIORS and decree it's SCIENCE instead of just some bullshit in my head), but to a great degree the plan now is get vaccinated and hope for the best and, well, we'd better hope!
Whether or not they're particularly helpful in reducing the spread in the aggregate, the tests certainly help people manage their own lives and reduce personal anxiety. That's important!