Sh@t happens a lot more when people have a false sense of security!
I agree with this most of all in the safety vs no safety debate. To me it adds confusion and uncertainty. Thats probably why my handgun of choice is a Glock. The only time you shouldn't treat a gun like its ready to kill someone is when you have visually confirmed for yourself the gun is unloaded. Everything else is just bs.
Even with new and inexperienced divers, if they aren't trustworthy with a loaded weapon they just shouldn't have it. They are just as likely to have a lapse in applying the safety as they are a lapse in gun handling that results in a trigger pull. There are friends of friends etc I wont dive with because they dont have the sense of urgency and care about speargun danger that I do.
I can see its usefulness as wishinihadgills said. In the same way mechanical safeties on some guns help prevent "glock leg" such as plaxico buress caught a few years ago. A mechanical safety is just a little extra safe if youre sitting on the back of the boat with a gun or passing it off etc. But the way most people perceive a safety I think is more dangerous then no safety.
Ive seen one too many videos of scuba divers treating their loaded spearguns like unloaded ones, or like a walking stick, carrying ticklesticks and nets as well. :crazy: