If my aforementioned points do not convince the skeptic of the gravity of this issue, consider the case of the skeletal summoner. This advanced skeletal warrior is specifically created with a higher intelligence that gives it the ability to replenish the undead ranks as needed. Yes, adding summoners to the unholy, undead mix results in a nauseating recipe for a self-sustaining army, capable of renewing itself in perpetuity so as to fulfill whatever diabolical ends its master called it forth to pursue.
It should be apparent to all intelligent readers that any madman needs only the raw material of skeletal remains to create these armies of the undead. The obvious solution is to disinter the graveyards and begin burning the skeletons posthaste. Only then can we be certain that we have removed this deadly threat from the arsenal of those who would do us harm. 
“Contrary to what I had assumed, a reanimated skeleton is actually constructed from bits and pieces of any number of different skeletons, not a single one.”