A lot of LEO departments just would rather spend their money on other things and liberals would rather ban things.
To be fair here, it's not entirely the fault of the department. I'm sure most of us are aware that people love services but hate to pay for such services. Unless you live in a very high crime area, many people think scaling back the police is a fast way to save money and lower local taxes. Some departments are lucky and their communities are very supportive. Many aren't so lucky.
In taking shooting development classes alongside a number of officers, they have all expressed to me that unless they dip into their own personal savings they received no additional training besides the academy. Besides their yearly qualification, many aren't given the opportunity to develop their skills. Now should they as of course of action for choosing that occupation? Probably, but let's be even-handed to an extent.
Long heavy trigger pulls can also be a detriment to safety. They require a lot of training to master... more time than the average police officer actually trains with a firearm.
Despite carrying DA/SA pistols for years, I have to also agree with this and it goes with my previous paragraph regarding training.
But i don't hear many solutions.
I think there's a danger in assuming that there always is a solution. What if there isn't? We're all here participants in a hobby/lifestyle that many would consider overtly dangerous. Those individuals would argue that the only way to be safe from gun accidents is to never own a gun. However, as folks have stated, including yourself, people are human and make mistakes. Even automobiles, which are very safe by today's standards, cannot prevent a driver from texting while driving or engaging in other distracting behavior. Does that mean we shouldn't drive cars? Either an accident with a firearm or a distracted driver can cause death.
It doesn't even need to be such a case of blatant negligence. I have yet to slam on the gas when meaning to hit the brake. However, others claim to do this in certain incidents. Again, should we not have cars? Now granted today we are incorporating auto-stopping features and maybe someday we will have that with firearms. However that may be a way off. I don't think the desire for safety is bad, but folks are simply expressing the limitations of today's technology and explaining it might not do as you desire and that there are caveats to really any solution.
Lastly, I want to point out that the 4 basic rules of firearm safety are redundant for a reason and that reason is human fallibility. Besides keeping your finger off the trigger until ready to fire, knowing the status of your weapon, not allowing your muzzle to pass something you are willing to destroy and knowing your target and what is beyond it are further means to reduce that chance of bodily injury. Most of the cases I've read here of negligent discharges involve clearing a weapon:
Ive been a cop for 35 years and there were documented cases where people jerked a double action ONLY revolver during such situations. Every single ND from a Glock that I am intimately familiar with were caused by no chamber check before the "disassembly pull".
In that case you have to violate more than one of those fundamental rules to injure a person. I have had a negligent discharge in the past. It was quite the wake up call. It happened with a DA/SA S&W 5903 and the pistol was in DA at that point. No one was hurt because I didn't violate more than one of those rules.
As for holding suspects at bay, I imagine this is actually a smaller percentage of negligent discharges than we believe. That said, again as folks have pointed out that even on firearms with a safety:
1)Acquire a firm and proper grip
2)Release/disable any retention devices
3)Draw pistol from holster, and present pistol on target, while disengaging safety.
By practice that safety should be disengaged by the time the muzzle is on the suspect. We've gone over the shooting limitations of DA/SA pistols for users with a lack of training and thumb cocking the first shot would present the same light pull as a SAO pistol, and both of those are typically lighter than a stock trigger weight on a Glock. If the threat is not immediate then that finger MUST be off that rigger, regardless of platform. In classes I have taken they have drilled us on this repeatedly. The officer can also move the firearm to the universal cover position or even a ready position if warranted to partially mitigate the severity of an injury were he/she to discharge the pistol (though this is by no means a solution).