Many very popular types of guns do not have "safeties" in the sense that you are likely thinking. They do not have a switch that can be toggled between "safe" and "fire". Glocks are one prominent example (they lack some sort of safety switch, although they have other sorts of safety features.)
Truly mechanically induced accidents are nevertheless exceptionally rare. The guns only fire when the trigger is pulled, which is why gun owners stress the importance of trigger discipline.
Another note on the glock, you have to pull the trigger to pull it apart.
All the more reason you follow the 4 rules of gun safety to a T with that brand. Especially the part about ensuring its not pointed anywhere it shouldn't be and unloaded check about a million times. (note, I own no firearms but have enough friends that do I gain a ton of knowledge on them.)
One exception to firearms going off on their own might be a misfire after trigger pull. That means you have a possibly live round in the chamber that could go off at any time. Need to be really careful on that one.
And you can't really follow Rules 2 & 4 when you holster it, unless you remove your holster first, which is often not a good option (like after the shooting appears to be over, but before others like the police arrive).
I will never willingly carry a striker fired weapon: no external hammer, so if something, like a windbreaker tie or finger catches on the trigger, you can't DTRT with your thumb on the nonexistent hammer to stop it from firing.
Flip side is what one of my instructors called manual safeties: "death levers". If you forget to flick it to safe....
Another side is that manual safeties make guns somewhat "proprietary" as Massad Ayoob puts it. Some police officers have avoided bad outcomes when their weapons were grabbed, as the criminal struggled to make it fire they could take effective action. Not so much of an issue for those who carry concealed.
That is why you wouldn't carry such a weapon as a CCW and hope for the best. You'd pick one with a safety if your goal was safety.
"Exceptionally rare" events that send you to the hospital should be minimized if you are acting rationally. Choosing an "unpopular" gun with a safety vs. a "popular" gun with a safety...well, that isn't giving up the gun now is it?
That is why I have an issue with gun enthusiasts. They don't think and they literally get people killed/injured because of it. Then go "well its rare..."
So fucking what. Cars have a ton of safety features to reduce fatalities too even tho such fatalities are "rare".
If gun owners continue to show poor judgement when they have time to think about it rationally, why should I think they'll do any better under pressure?
Truly mechanically induced accidents are nevertheless exceptionally rare. The guns only fire when the trigger is pulled, which is why gun owners stress the importance of trigger discipline.