Because people are autonomous creatures. You can't tell a thinking adult what they can and can't do and how often to do it. Enforcing this is impossible and results in toddlers being kidnapped by rogue traffic police. That's why you have to rely on people making their own informed choices.Why don't we just dedicate big part of Sunday to everyone over 50 years old? And remove the lockdown, aim for slowed down herd immunity. Except for physical distancing and group gatherings, allow family to visit each other once a week or just put the guideline there. At everyone's own discretion (must ask permission)
That way the elderly can go the beaches, visit parks do their shopping and whatever they want and mostly avoid the younger working class. Could make sure the Staff on Duty that Sunday is different from the day before.
The ANC already has hegemony in the minds of the masses, so they can issue sensible guidelines to people and they will be followed. Anything else is Soviet propaganda and control.