Your right, nobody needs a handgun. Not the police, military, politicians' bodyguards or criminals. But handguns exist and they are here to stay. As long as the previously mentioned groups of people still have handguns I expect to be able to own them as well. So, the same argument can be said for motorcycles. Nobody needs them.
Not true. Motorcycles are a viable alternative to cars the world over. Guns? #1 purpose is to kill. Pretty basic.