i dont think a drone and a commercial aircraft will do much, if anything, as for nuclear power, well, only 15 world wide... others have died from cancers, but at a rate no worse than the gloabl average..
back to drones, they are very light compared to an equivelent sized bird, they are a plastic housing, with a few small circuit boards, 4 small engines about the size of a few coins, and a battery.
in all seriouslness, i doubt they would cause more damage than a bird..