Gagajo The problem is not that people did not comply with the rules they did, but this current reactive government did not think things through clearly. In highly populated urban environements, where many people, especially families with children, live in cramped and inadequate accommodation a complete lockdown, with people housebound is going to cause more problems than they solve. If people have to live in prison conditions, you need an enormous number of people to police them. The ratio in prison between prisoners and warders is quite high. This would not be practical
The result would be a rapid rise in mental health conditions and domestic abuse of all kinds, including suicides and murder. It would, in hot weather, lead to wholesale rule disobedience and probably rioting.
Similarly the crowding in public green spaces is because of the high ratio of people needing to use the space to the size of the space. There is a simple solution and that would be a rolling curfew, where neighbourhoods were allocated times when they could take exercise in public spces, with adjoining residential areas heavily policed during their curfew time.
All the problems of not distancing have risen in urban areas. In the quite highly populated rural area I live in, there has been very little flouting of distancing, because there is plenty of space for everyone to get out locally, walk the footpaths, wander around the village and for children to use the playground.
We need some open and constructive thinking on the subject not just constantly blaming 'other people' who is, of course, anybody but us.