I think the best defence of 22lr not being in FMJ is because it is not realiable, no primer, just hit the case to fire. I do not think companies want to market it for "self-defence" because of the failure rate of not going off, no realiable primer.
SHTF vs TEOTWAWKI you ask? SHTF, just some crap on the ceiling and walls, TEOTWAWKI end of the world as we know it. Orignally made by 9mm/®™©