[bombcar]

There’s also the “if you ever pull the trigger in a situation where the safety keeps it from firing, you are doing something horribly wrong”. People often treat the safety as a “gun off” switch when it should never be considered that. I understand the Glock philosophy - no gun is “safe” until you’ve personally verified that there is no ammunition in it at all, and even then it should be treated as if it is loaded.

Relying on a safety to keep it “safe” is usually the first step in ventilation of the floor or ceiling.

[Doxin]

I invite you to re-read my previous comment and meditate some on what "defense in depth" means. Of course you're not supposed to rely on the safety, but that doesn't mean it should be removed. The entire point of defense in depth is to construct things in such a manner where a single mistake is not enough to cause trouble.

[bombcar]

It depends on what the purpose of the firearm is for.

Play-guns for the shooting range? Sure, add fifty safeties if you want.

But guns are used for other purposes, and there is a failure mode where the person holding the weapon intended to fire and end someone's life and the gun fails to do so because the safety was still engaged.

Many things are purposely designed "fail-safe" but some things are designed to "fail deadly" for very good reasons.

And I wouldn't be surprised if the negligent discharges that can be categorized as "I thought the safety was on and was pulling the trigger like a moron" is much higher than "I knew the gun only had a grip/trigger safety and was pulling the trigger like a moron".