If you are a harder target to hit while you’re moving, then why would you ever stand still?
Well, it’s harder for you to get hits when you’re moving. A laser sight can help with that because it dramatically simplifies the aiming process. With a laser sight you do not have to line up your moving head, with the moving handgun, and the moving sights to get hits. You simply focus on the target/threat, which is most likely where your focus will be anyway.