2 reasons...
1. People can lie when they are surveyed, thinking they will score brownie points in the ether.
2. People don't know proper mask discipline. How many morons out there do you see wear the mask not covering the nose, and/or touching their mask in the front to adjust it, then rubbing their eyeball?
Don't forget the ones that pull down their face mask to talk to the person standing next to them.
I use to post about this about college football / basketball coaches doing such when yelling at a referee that's only standing a few feet away.
Later, when the referee, the coach or players on the team test positive for Covid-19...they were the first to say they followed all the protocols and can not understand how they became infected.
Then there are those wearing the same dirty (infected) mask multiple days without changing their mask, without washing their mask and then touching that mask and the touching their face or eyes (another portal for Covid-19)...these are people with poor hygiene...that's really all it is.
These are probably the same people that don't wash their hands after using the toilet and then think their germs from their hands can not infect / cause harm to others with something like cholera, typhoid, hepatitis, polio, cryptosporidiosis, ascariasis, and schistosomiasis.
Luckily, we have vaccines from some of the above diseases.
wrbtrader