I don't think my comment implied that any testing and validation process will be fool proof. There are two claims in the comment I replied two, first that people are creating "more bugs than ever". I take that to mean more bugs per line of code or more bugs per unit of functionality or something like that. If that's the case, then I think it implies that testing and validation has gotten worse per that same unit, which I think suggests that it could be improved, without expecting it to become fool proof. Then there is a causal claim, that these bugs are because people are not thinking about the code. Maybe so, but to me, it seems more likely to be caused by inadequate validation.