Nope. If that wasn't true you could just leave a gun hanging around and you be protected. If doesn't work that way.
False. A gun can represent a threat. An assailant preparing to rob what he thinks is an unprotected elderly lady has a different equation to work with if she opens her purse and pulls out a weapon. In that case, he has a decision to make. Either run away and live another day, or persist in trying to rob her and potentially lose his life. She doesn't have to kill him in order for the presence of the weapon to have a positive impact. You're simply wrong, know you're wrong, and are flailing desperately trying to find a way to salvage some pride. Here's a clue, you can't. Just walk away knowing you failed, big time.
If you pull out a gun and don't shoot anyone, you didn't need the gun, period. Some guy trying to steal an old lady's purse isn't going to give her the chance to get to a gun. When he steals the purse he gets that as well. For some guy planning to rape an armed college girl it's the same thing. He get sex and a gun, which she never had the time to pull.
Dude, you keep painting scenarios that simply don't matter. And you're spouting lunacy. An assailant approaches me with a knife in hand and demands my wallet. I pull out a gun but don't shoot it. He runs away. I don't pull out a gun and he stabs me because I don't have any cash in my wallet. Clearly the gun had a positive impact without being fired.
Sometimes, the fish in the barrel don't even move. Heck, you might as well say visible body guards have no impact on anything unless they attack someone. And, you never answered the question. Why do you get a sign to put on your lawn stating that your house is protected by an alarm system? According to you, nothing good comes from that.