I agree with both, really. Those defects are our fault, and they are there because we aren't careful enough with the code we write. We know about these things,

I agree with both, really. Those defects are our fault, and they are there because we aren't careful enough with the code we write. We know about these things, and yet, we don't work to prevent them. We either handwave them away, or we give into management pressures to just get the thing out the door. Now, that said, one of the ways you can work to prevent these things is to use better tools. Like languages that don't let you make those kinds of mistakes as easily.