Situational awareness or lack thereof causes things like this. I'm always surprised to see people preach 'professionalism', 'intergrity' and other buzzwords and then say that it's ok to not advise a change of plans that may not be as odvious to others as it is to you.
I've heard many, many pilots advise ground they would have to hold short of the ramp area, 2 or 3 seconds of (non essential, but intelligent) radio communication can save millions in damage.