The small ones are not strong enough to do that.
Your arguments needs to shift to the differance between vermine and turtles, or just tell him you don't care about his opinion. Otherwise, he is right and you are stuck in a quagmire of trying to conform to his opinion, when you obviously don't care.
I already told him I didn't care about his opinion. I'll buy some snap traps next time if it make you all feel better.