Andrasz:
qsyenroute: accidents during non-precision approaches don't happen because of the lack of precision navaids. They happen because time after time someone thinks that those minimums are just a suggestion, and they can go just a bit lower...
Are you saying that deliberately busting minimums on NPAs is the only reason they are less safe than a precision or other type of vertically-guided approach?
I hope that isn't what you intended to imply.