It is indeed overdue to think seriously about gamma-ray bursts because their frequency had been 1 in every 64 million years (judged by the 300 bursts/year outside the Milky Way Galaxy). Taken that in the early Universe this frequency had been twice as high, such an event in our galaxy might wipe us out before human civilization begins to decay, due to depletion of natural resources! It is basically the social instability caused by chemical changes in the atmosphere which is the most probable mechanism for a world-wide famine, triggering fierce wars for the remaining intact land.

Your recipe is that of a bloody communist! (and I am a pauper!) I have been living in such a communist country for 30 years where your kind of mind set had been part of government policy. Now this country is sinking in chaos and corruption. You are probably no patriot either because this kind of advice "anti-arthritis death squad" or "killing the rich" reveals Your antisocial pathology only. In a real world, You will find very few people, maybe only the most stupid ones, who would yield to this kind of instigation. Your words are even too bad to be meant as a joke either!

Your reservations are premature for more reasons. Even if this will generate more social segregation and injustice, mechanisms to make the treatment cheap and ubiquitous will soon kick in. In a world where automatons will churn out automatons, more people can benefit from this kind of medical progress. You probably do not know yet that terrestrial ressources can be extended by those of the near Earth asteroids and ENERGY will be plenty and dirt cheap via hydrino reactors. The world of the future will be much less formidable as some hysterical blockers do believe now. But there are dangers too, e.g. military adventures eased by armies of combat-robots might be the real danger here, but only for the weak not for the strong.