Because it still isn&#x27;t cost effective. A drone that can be guided, either autonomously or by a human, will cost at least, what, $80 wholesale? That will almost equal the price of the ordinance. Causing a lot of casualties at a low cost is one of the major appeals of field artillery and explosives.<p>Now, maybe it would make more sense for the assassination of carefully guarded targets. But it will probably be a few more years before that technology is more reliable than strapping a vest containing c4 on someone.