Are they really? All of them?
Maybe some are going out of habit, or to be seen, or to show off a new outfit, or to be with friends, or eat potluck.
Satan prowls the world looking for souls. I don’t think it’s a stretch to believe he occupies a pew in lukewarm “churches”.
And I guess you’re the expert on which churches run at the proper ‘temperature’.
Just leave other people alone, to worship in their own way without controversy.