" I suppose such people will be the ones that live the longest in that harsh new world."You mean as a general fuel, or as fuel for the already burning fire, as @SOCOM42 described?
That said, the chemistry should still work.
It would take a morally detached individual to do the work, though I suppose such people will be the ones that live the longest in that harsh new world.
I can't image the source would be all that plentiful though.
Unless death was quick and caught a large population off guard, you likely won't find too many fatties that starved to death. You'll find distended people with excess skin hanging off of them. Their own bodies will rapidly consume the fat for energy when the food runs out, assuming they can get just enough sustenance to keep their vital organs functioning.
If death was quick, and large groups died off quickly, you'd have enough time to trim out and render down a few, but the corpses would go rancid within days. The fatty tissue would break down and turn to liquid.
I would not count on this as any sort of backup plan.
To avoid the spread of disease, disposal should be prioritized.
YEAH, ONE OF THE BASTARDS IS STILL ALIVE TODAY, AN EX SAUNDERKOMMANDO!
HE WAS AT THE CENTRAL CLEARING POINT and EXTERMINATION CAMP, AUSCHWITZ-BIRKENAU. The name, George Soros, almost everyone in the civilized world knows that name.
"Unless death was quick and caught a large population off guard, you likely won't find too many fatties that starved to death."
I was common in pre-war Europa that the middle aged women were fat, a medical leftover from the 18th-19th century, where fat women were considered "healthy". WW1 did not change that perception.
In the selection process at the camps, those fat women and with their kids, went directly into the gas chambers, hence plenty of "fatties".
Others were worked to death to where their bodies were like dried logs to add to the pyre.