Is there a name for that stupid argument that goes something like, "There's no point in outlawing X because criminals who are intent on breaking the law a will find a way to get X anyway"? As if making X illegal won't make it harder to access, including to would-be criminals?

Yes, this remark is primarily motivated by recent events in the news (USA) but there are so many other things where this sort of argument comes up. I don't mean to say I support every sort of restriction that this is meant to argue against, but it's a poor argument most of the time.