Regarding the "new exercisers"... I don't think that just because more people are now visible to you means they are new to exercise!
Eg Previously, the kids round my area went to school/sports clubs/dance lessons/ holiday clubs/playgrounds/softplay/ trampolining and also day trips to beaches, woods, parks etc that are now off limits due to distance.
Now, if their families are following the rules, they are limited to a walk round the suburb they live in.
So they are more visible to the people who used to have those streets to themselves even though they are getting out much less. Same goes for adults who used to get other forms of exercise (gym, cycling to work, exercise classes, hiking, swimming, even just walking round the shops!)
They have every bit as much right to their local areas as those who were lucky enough to have those places to themselves up till now.
I don't understand why people can't grasp this?
I run at night - around 10 pm I see almost no-one. If they limited exercise to night time, no doubt my solitary runs would become busier. But that would not be because people would be taking the piss. I don't actually have a greater right to the street at night just because I "got there first".