But that poses many problems in itself:
Methodology - Guns are out, as are plastic bags, drowning would waste water. I guess that would leave hanging, but; cotton or manila?
Disposal - Cremation is obviously out, as is burial at sea. We could just put them all in Greenland, but hell, that place is melting. Soylent Green to recycle?
Heck, we could wring 'em out really well before disposing of them in that big 'ol secret salt dome where we dispose of all that nuclear waste! < /sarc >