Yes, I agree, double action first shot is not a big deal at 5 to 10 feet, especially if you train with it and you are shooting relaxed in a range. Under stress it can be a different story, law enforcement miss at those ranges with DAO guns and striker fired guns which have heavy pulls to mimic a DAO trigger such as the NY Trigger in Glocks.
For example, in 20 seconds of googling I came across this example right here where New York cops hit 9 bystanders.
http://www.nytimes.com/2013/01/23/n...ice-near-empire-state-building-sues.html?_r=0
As far as you statement that "any modern pistol that has 100 rounds through it to ensure the ammo works and the gun functions, and is stored for home defense will never fail", I don't agree with that whatsoever. I have shot numerous pistols which have had malfunctions after they have already shot through the same ammunition with no issues. For example, I had a CZ 75b SP-01 tactical which shot perfectly the first time I took it out, I shot around 500 rounds the first time, the next time I took it out with the same ammo I had numerous malfunctions, mostly double feeds. I continued to shoot that pistol for about another 3000 rounds before I got rid of it, 90% of the time it shot reliably but I did have the odd malfunctions, again mostly double feeds.
I have shot tens of thousands of rounds through various Glock pistols in various conditions from indoor ranges to poring rain, to harsh desert environments and I can count all the malfunctions I have had on two hands and most of them were caused by myself from "limp wristing" under heavy sustained fire while moving. Some of these Glocks had basically no maintenance/cleaning/lubrication.
I have also had two high end 1911's which both fired 250 rounds the first time to the range with no issue. Both of them had about 3 to 5 malfunctions the next time I took them out and every time after while shooting about 200 to 300 rounds each range session. This was all using the same ammunition. If I was in the position of the OP, this could have cost me and/or my family our lives If I had been using these pistols for self defense and if I had the same thinking as you seeing as how they functioned perfectly the first time to the range.