Glad you enjoyed it ^^
I'm familiar with that mechanic of the android being different every playthrough in the actual Bladerunner PC game, but I've never heard of that being the case in Snatcher, I always thought it played out the same way no matter what.
They were in the hallways, not out on the street. I didn't look for any cameras, but there wasn't any security nearby that would've seen anyone vandalize them. If there were cameras, I can't imagine it mean much to people wearing a mask.
I'm not saying vandalism isn't more common in the US, I'm sure it is in compared to hyper-respectful Japan, but I don't think it's absolutely impossible to have these.