Loc22550, you are right, many of the rostering mistakes goes unnoticed because they are not monitored by anyone.
I personally got removed from a nice layover because of an arrival delay after working for 14 hrs, yet was rostered for a worse flight just after 12 hrs (that was still illegal) I had to keep calling till I found a supervisor who understood what I was talking about, and admitted the mistake.
I was surprised to be the one to correct their mistake, and just wondered, what if I flew and had an incedent ? will I be forgiven?? Don't think so.