Both are messages coming to you. Just because they have the right to metaphorically knock on your door doesn't mean both campaigners and vacuum cleaner salesmen

Both are messages coming to you. Just because they have the right to metaphorically knock on your door doesn't mean both campaigners and vacuum cleaner salesmen don't get the door slammed on them and doormen won't tell both to scram if they try to visit apartments unsolicited. The difference in categort broadness seems classically strawmen as well.