[Graymatter]

How do they explain the Neandertals in warmer climates? How did these people thrive for over a hundred thousand years and succumb to this one Ice Age?

I'd bet their heads got too big for their breeches. They had bigger brains than ours and might have started evolving bigger ones at a rate that cut into their birth rates. Mothers' bones don't change proportionately and maternal death rates went up.

As for food acquisition, it's kind of silly to think primitive humans depended on spears, just because we dig up more spearheads than traps and nets.

[RightWhale]

it's kind of silly to think primitive humans depended on spears

Clubs are even more severely underrated.

[Calamari]

Wide spread acceptance of same sex marriage?

[blam]

"How did these people thrive for over a hundred thousand years and succumb to this one Ice Age? "

I think it is closer to 250,000 years. The cold didn't get them. We are Neanderthals.