I do think that people should follow the rules, but I understand the confusion. A lot of them don't make sense, and there is also the 'use your common sense' mantra that politicians have used to justify their own disobedience of them. To a lot of people, the fact that they don't feel ill seems to be evidence enough that they aren't infectious, so it feels like 'common sense' that it will be ok to do x, y or z.
I agree that this is a short-sighted approach, but the only way to be sure that you won't get the virus (and even that is not guaranteed) is to stay indoors and not go out at all. If people are going to the shops, the hairdresser, on 'exercise walks' or whatever, they are probably at as much risk as someone taking sensible precautions when they visit a neighbour, and pose as much risk of passing it on if they are infected.
We don't know the circumstances of other people's lives, and we have no right to make assumptions about our neighbours. The willingness of some posters to assume the worst and report people is worrying, IMO. This virus is going to go away one day, and when it does it is likely to leave behind an even more divided country than we were when it struck.