That's like saying you only write code you know to be bug-free :-)

I know I make mistakes all the time. That's why I use as much unintrusive help as I can get. I'm not making an ideology of sloppiness, of course, but I don't chastise myself unduly for things that can't be helped. Oh, perl found a problem in my code? My bad; let's move on.

(Of course I'm a better coder now than I used to be. I do learn from my mistakes; I just try not to spend overly much time on the learning itself. Also, warnings in this case and in many like it would have saved you from a real trap.)