ok, i'm gonna spill a little secret for all of you who have problems with former humans on the 1st level getting your medpacks:
use coward tactics
walk up to the (suspected) medpacks thief
hit him with your fists
once you have landed 1 hit, change to agressive tactics and kill him.
about 75% of the time, you will be able to kill the former human without him using a medpack.
now nobody ever dare to whine about them thieving former humans again, i think they're just misunderstood!
p.s.: there is also a method of killing the thief with the pistol, if you time it right, without any use of medpacks by said thief.