The thing is, sometimes the people judging others are often popping into their local shop getting a newspaper thinking there's nowt wrong with it.
The problem being is the "What's the harm in it?" attitude.
If the general population stay home and only go out for essential food or medicine, and as seldom as possible, and only when essential; go out otherwise only for one form of exercise (walking, running, cycling) in your locality, when passing people keeping a social distance of at least 2 metres (6ft), then the risks are massively minimised.
Any time any of these things are ignored or skewed in any way is when the virus can capitalize on it and transfer from host to victim and onwards.
In one day, today, I have seen one builder, a very sociable one in our area, in very close proximity today with five groups of people. In one case a woman was rubbing suncream (I presume) into his face and his workmate, then rubbing the excess on herself. All these groups of people are known to us, not daft or stupid, but unfortunately through natural human behaviour, lapse into forgetting the current situation briefly.
If we all abided to the instructions then we would be in a much safer place.
The devil is the "What's the harm in it?"