Sexual dimophism means that male predators and female predators are statistically likely to use different strategies. For example men are more likely to use intimidation while women are more likely to use deception. But it does not mean that men are predators and women are prey.
Sexed color perception being the result of hunter gatherer division of labor, certainly makes for a compelling story, but have you checked it ? The bare minimum would be looking for research that confirms or refutes that women are in fact better at spotting nuts and berries.
It's plausible that in primitive society men would have the duty to defend the tribe. But i don't think that humans were really besieged by beasts. Most wild animals avoid groups of humans, even many apex predators that are stronger than humans, do. So there is at least the consideration that by the time the modern homo-sapience came along our ancestors were already the dominant species. My guess would be that humans were really effective at hunting most large animals into near extinction and therefore the surviving ones inherited instinct or learned behavior of avoiding humans. I think that women probably also hunted, probably not big game with spears and nets but archery seems plausible. Many women seem to enjoy it as a hobby today.
On what are you basing your assumption that there are organ harvesting gangs lurking behind second-hand trade and hook-up apps? If you have an insight where the organ harvesting gangs are stalking their victims these days. You probably can get rich off that by organizing what would be a modern day bounty-hunter guild. Like being the go-between of private investigators, private security and police.