When I clock in at work, my labor directly generates profit - I do a task, company gets money for it.
A cop breaking up a strike is defending the system. The cop is not directly employed by a private parent company (usually). Unless the company is being directly paid by a customer, directly for this cop’s action, and the cop is directly paid a wage by said company, the relationship is different.
There is parallel benefit between cops and capitalists, but one does not have direct authority over the other.