Well, I know that and agree it's bad but don't think it's as bad still, for the simple reason that I think that, if it is true that someone is planning to commit terrorism, it may be justified to kill them, if other methods of preventing them are not practical.
Drug smuggling doesn't pass even that test. If you can't prevent drugs getting smuggled into your country without killing the smugglers tough shit, accept that there will be drugs in your country and do your best to deal with that. That's true, I think, even if you think that drugs should be illegal.
So to me that makes a big difference.