I don't think it's necessary to kill the coon, but I agree with the post above about fortification. hardware cloth is the key, with no more than a one inch gap anywhere, wall to wall, ceiling and floor... the best investment I've ever made! coons and rats and cayotes and foxes and bald eagles all "hang around" in our neighborhood, if i were to try and kill them all i'd be an obsessed nervous wreck. the key is to assure the coop is impervious. I kind of feel like you are both right, to a degree. something probably should be done to take the threat seriously but not necessarily the extermination of the latest critter to come by, if you remove one, there will be more, always, it's just a matter of time.