@Val Killmore,
I know what your statement as written implied because I can read. Perhaps you should have written your true intent if you didn't mean what you wrote.
I am curious how you propose to enforce a law that bans flies. Who will you prosecute? Your attempt to use flies is silly because humans don't own, manufacture or sell flies.
In the case of guns, we can jail a person that violates the law. Humans have control over guns when they own, manufacture and sell them.
By the way, we do pass laws to help restrict the number of mosquitoes when we pass laws that restrict standing water. It is illegal for me to keep old tires on my property that contain standing water. Mosquitoes still exist but we do try to control them.