Simple solution ... don't chamber a round in a carry gun.
but then there's the day your forget you have one chambered
I personally chose pistols with a manual safety.... but then these can inadvertently get swiped off.
In the final analysis, there is no substitute for diligence.
A man's got to know his limitations!
If you tend towards absent mindedness, or operate in an environment with non-stop interruptions and redirections of your attention, then prudence would suggest some add'l measures to serve as a back up, in case you make a mistake.
Anyone can make a mistake with a handgun. But there are things we can do to make the consequences of that mistake less disastrous. And what works for you in your situation, may not work for somebody else in different circumstances.
Bottom line is that no measure of nanny state regulations and ambulance chasing lawyers will prevent you from ultimately reaping what you sew.
If you choose to carry.... YOU, and you alone, HAVE TO be responsible for your actions and take any and all measures needed to ensure you do so safely.
I feel bad for the guys wife and kids. He was probably one of the "good guys" and cared enough for his family to take measures to provide for their protection.