I still think they are doing this because of a minority of self entitled piss takers.
They are doing it because masks are immediately visible and they want someone to blame for the clusterfuck we find ourselves in.
There are loads of piss takers. You can't tell if the perfectly masked person next to you has just picked their nose and not washed their hands, or if they went to a secret party a few days ago, or if they've got symptoms and haven't been for a test or if they've been told to isolate but have gone to the shop anyway ...
There are far, far greater risks than someone not wearing a mask and which are not much mitigated even if someone does wear one. We can't see those things though and we can't control them.
The basic issue is being with other people in indoor spaces, full stop. The more people in the space, the closer you are together, the poorer the ventilation, the greater the risk. Masks or no masks.
We're social creatures with lifestyles built around gathering together in public places and businesses need a certain throughput of customers to remain profitable. How convenient and psychologically comforting it must be to imagine that being with other people in indoor spaces could be safe, if only we could exclude The Unmasked.
Masks probably do make a bit of difference, so you should wear one if you can, but fixating on other people's mask wearing behaviour is a massive distraction in terms of risk and shits all over disabled people.