If the intention is to enforce the Covid 19 regs / laws then surely the police have to go where the breaches are happening. Police have been to Gyms, Pubs, parties and raves, then supermarkets have to be considered too.
Surely the people who do not wear masks in supermarkets etc., while not exempt, are engaing in their own form of protest and should be dealt with accordingly?
One look at history would suggest that radical change doesn't happen without conflict, e.g., the english civil war, the (US.) war of independence, indepence in Vietnam. However people could follow the way of Ghandi with peaceful protest .