Any movie theater that does not limit attendance to sub-10% capacity, with at least 2 employees watching with infrared goggles to enforce near constant mask wearing and only allow drinking (no popcorn!), is unsafe.
That is what is necessary, masks and 6ft distancing. 6ft. Not 5 or 4ft. Do the math. 25% capacity is STILL too much density. Seats are not 3ft wide. Do the health math, not the theater profit math.
The virus leaves your nose and mouth when you eat and drink. People love to eat and drink at theaters. people can be eating and drinking for many dozens of minutes each movie.
Sure, theater could be safe at 25% capacity if everybody is wearing n95 masks instead of cloth masks or (god forbid) bandanas. Maybe even 50% capacity if you enforce mask wearing 100% of the time (Go outside to drink.) but the experience would suck.
The magic word is "Herd immunity". When (if) that happens and covid is nothing but a bad flu, theaters can go back to normal. Until then, you are putting yourself and potentially others at risk for your love of the arts. There are worse reasons for risking lives and killing people than Cinema but I'm going to stick with my TV.