Well, although many states do have specific regulations that's not why guns have safeties. For instance the 1911 has had a safety for over 100 years and S&W has been putting safeties on guns for a very long time, simply because some shooters prefer them and before firing pin safties it was just one more way to insure safety. I don't have a problem with people that enjoy the safety and even have a few guns with them myself. Key locks are due to political pressure on gun manufacturers. If they were smart they would only sell their guns to the free states anyway since most states that require them end up outlawing the guns anyway and the rest of us still have to put up with the extra bs including key locks, extra cost due to microstamping, etc. but really all of this is getting a little off topic so I digress.