Software utilities like Notam Plot (and others) mean there really is no excuse for this kind of sloppiness. Why can't people act with a care to others and exercise more responsibility I ask?
Let me turn it around for a moment.
As someone who does check NOTAMs and plan accordingly, I've been rather frustrated in the past by the number of NOTAMed events thaat have clearly been canceled, some at a relatively early stage, and yet no one has bothered to cancel or amend the NOTAM. On a recent flight, a call from my colleague to a well known gliding site whose activity was NOTAMed go a response along the lines of "of course we're not gliding today, the weather's awful".
Responsibility goes both ways.