I doubt that they sincerely believe it will do any good. They simply hate the thought of firearms in the hands of ordinary citizens, although they have no problem with government having a monopoly on force. They’ve substituted belief in God with belief in government as the all powerful entity. They may not think of it that way, but in effect that’s what they do. I know people like that and avoid them when possible.
“government having a monopoly on force”
Rockets have been shot at Israel from Gaza for many years.