If you need a personal cage to feel safe, then maybe the problem isn’t the bus.
I’m not afraid of someone doing something to me, I’m more concerned with whatever illness they may have. People are gross, I like my space. You do you and ride a packed a buss full of people with some no doubt sick, and some with terrible hygiene that stink. I’ll ride in my luxurious and fast car enjoying my heat and a/c with my heated/ac seats and great sound system.