There is no logical reason to close the theaters.
Sure there is. The theatres aren't bringing in enough money to keep operating. If you have a business, that's about as logical as it gets.
As for why people aren't going to theatres, well, because. People are scared, obviously. People may be broke, too. People are discovering that they really can live through the Internet. People don't trust experts/polticians/society and are taking their safety into their own hands. Whatever. It doesn't matter anymore. Enough people have indefinitely bowed out of aspects of the economy that businesses structured around a certain amount of asses in seats are fucked, and no amount of talking about the problem is going to change that at this point.
Bottom line, if anyone wants theatres to operate regularly again, then the numbers of active Covid infections needs to fall and stay down, and that needs to happen because less people are getting it rather than someone just fucking with the numbers. Whether that's going to happen quickly enough to save those industries is the only open question, but it's not looking promising.