One of the major factors contributing to the public's fear of mutants is that they will one day outnumber humans as the dominant species. This was clearly no longer the case after M-Day (and it is arguable if it still is after the events of AvX). My question is, why didn't all the paranoid bigots just decide to let the mutants die out? If my information is correct, Wanda's spell didn't simply remove the x-gene from all but the remaining 198, but she made it impossible for mutants to be born. Why were their governments still building Sentinels when the threat they faced was staring extinction in the face?