From the dawn of time man has made magic and myth of anything that does not have a simple explanation. And, it would seem that no matter how much we come to know about the world around us, the allure of myth, evil spells, curses, and spirits cannot be overcome.
In this particular case it appears that the Iceman has it in for anyone that disturbed his icy slumber. If the curse is true, than shouldn't he be laid inside a lead vault or something to stop his superpowers? And given the reach of his curse, what possesses so many people to rush to his side to look upon his body. Are they not then also exposed to his curse.
I think another explanation of these myths might make more sense. My explanation is that archeologists, as a group, are inherently sickly and accident prone.