Because they don't want to. Simple answer to a simple question. basic brain function, choice. Repeat the past over and over and expect a better day noon to midnight than arrived midnight to noon each dawn to dusk, 7 days a week, adapting in plain sight, one of a kind.
Apathy is salvation to a sole with instinctive empathy as to why everyone agrees to disagree about living self evidently here in series parallel evolving situation per reproduction native to this universal location.
Personal brains arrive with conception as social minds are developed every generation gap cradle to grave from within the species itself. Oops honest is a terrible thing to ignore.
Karma comes to those never accepting how they arrived here so far. Natural world order exists regardless which New World Order you selected to become a member of reality in until extinction happens.
What is the actual extinction event between each ancestor lived and alive within this species regardless race, creed, color, national origin, gender, generation gap, ancestral lineage? No more great great grandchildren generation gap arriving again.