This is an interesting thread. I get asked fairly frequently on recommendations for carry or HD weapons. Given the more pervasive advertising for semi-auto's, they're usually predisposed towards bottom feeders.
My consistent advice if they're looking at striker-fired pistols - it needs to have at least one external safety. While I agree with proper holster choice, training, etc. it's unlikely these criteria will be universally adhered to. If the weapon has an external safety, it's there period.
IMO, a safety-less striker-fired pistol is not equivalent to a DA revolver. Trigger movement is much shorter regardless of weight of pull. Even 8lbs. is not sufficient. A comparison I'll typically use is if you're comfortable carrying a 1911 in Condition 1 with the thumb safety off, and grip safety pinned, then go ahead with something like a Glock. I've even seen folks at gunshows getting 3.5lb. trigger setup's installed in their Glock CCW guns. Good grief.
Regarding the 1911 info posted above...I'm curious. I've built a few and worked on several. The thumb safety blocks sear movement. If the lug were to wear enough to allow the sear to move incrementally, the hammer should fall to half-cock. Even if the sear breaks, there's really nowhere for the metal to go... Also, the grip safety has to be depressed to allow the trigger to move enough to disengage the sear. On Series 80 guns this would be required for the firing pin to move. Proper function tests and occasional inspection is always a good idea, but the 1911 is an inherently safer design than something like a Glock.
Again, practice and training, but it's pretty easy for most safety systems to become just part of the manual of arms. I have to doubt they add any delay in preparing the weapon to go bang.
Funnel