Are they really on “Crack” :)
Yes.
Same psychology of doping the Japanese kamikaze pre-flight or in-flight. But their minds have already been fried from birth with Kimilsungism and Juche, and particularly if they have been chosen for such sensitive infiltration and attack jobs on the South in the South's territory. For training purposes, they use real, live, political dissidents in the DPRK in special camps. Shooting them, bayonetting them, men women and children alike, to toughen them. If any such DPRK special elite army or navy commando so much as barfs or shows remorse over such hideous acts upon their fellow North Koreans, many whom are innocent, he or she is OUT of the program, and I mean "out" in more ways than one.