Punishing the other employees of Dischem is going to achieve what exactly?
Their role is making sure the policy happens. There is no law in South Africa stating who is white and who is black. A principled objection by a few employees to this by saying all their employees are "black" would knock down the entire tower. What is going to happen? Is some auditor going to do a pencil test on all employees to make sure they are actually not black?
You want change, take up terrorism like the ANC did in the Eighties.... or vote them out.
Why would anyone need to sabotage the South African state? What damage can a terrorist group really do that the ANC's style of management hasn't done already?
Cut off water to a major metro area? Oh the ANC has already done that.
Blow up parts of a power station? Check.
Completely dismantle public transportation? Check
Make sure schooling doesn't happen? Check
Make sure healthcare services are disrupted? Check
Disrupt international shipping? Check
Cause fuel shortages? Check
Make sure police are unable to do their basic function? Check.
Damage a mine tailings dam to the point of collapse? Check.
Make sure critical drainage infrastructure is damaged such that a bit of rain washes away an entire city? Check.
The only thing a person needs to do to "change" the South African state, is simply state proof their lives such that they can watch the ANC destroy everything from their stoeps without it affecting their lives.