Of course the snowball fight was wrong under the lockdown, but I think it was a spontaneous response to weather conditions, not an organised event. It doesn't mean none of them care about other people, maybe just thoughtless behaviour rather than a conscious decision?
They would have been in the area legitimately if out for exercise, it's the activity that breached the rules about socialising. Hopefully being outdoors will mean absolute minimum spread, although with this new variant we can't be sure.
For the record I do have frontline nursing members in my family. Their first cry is they want people to wear masks, and wash their hands. And they'd like masks to be compulsory the moment you step outside your home, not just enclosed spaces.
What Would You Do in this Position?
Mysterious hole - help please!