I don't understand the mindset of "you did it wrong once, so you can't do it anymore, you must let me do it for you." Why is the fact that some devs sometimes

I don't understand the mindset of "you did it wrong once, so you can't do it anymore, you must let me do it for you." Why is the fact that some devs sometimes screw up one-liners of any material importance to the existence of this library? Some devs write code with bugs, does that mean they shouldn't write code any more? Is it either you write pristine, bug-free code on the first try for everything, or else you should be relegated to the back room gluing things together built by the _real_ devs? This is such snooty behavior that I'm not surprised at all by a response like the angry dude in there. He's an asshole for sure, but he's not totally wrong in my view.