I'd take it in reverse order: the problem isn't that it's possible to have a computer that "stochastically produces the next word" and can fool humans, it's why

I'd take it in reverse order: the problem isn't that it's possible to have a computer that "stochastically produces the next word" and can fool humans, it's why / how / when humans evolved to have technological complexity when the majority (of people) aren't that different from a stochastic process.