I guarantee it is the same as every bureaucrat's argument for keeping the great unwashed away from the pristine - "only we can do it right" which boils down to this:
When a government functionary can use the government as their personal bully to keep others away from "their" piece of the pie, they will do it. If the current holder of the position with the power doesn't do it, then the next guy in the job will.
- or -
When evaluating a new proposed law, regulation or rule, never look at its expressed intent, but rather imagine how that law, regulation or rule can be used and abused in the hands of the most greedy, calculating, unscrupulous scoundrel on the face of the earth - because that is precisely who will eventually end up with the power to wield it.
- or -
The world is filled with sour people whose apparent sole function in life is to suck the joy out of anything and everything they touch, and to deny any fun or joy to anyone else. These people are attracted to government, for that's where they can do the most damage.
Rick