We know that the life is short, but still we imagine it like an eternity. And so any problem we have become in our mind an eternal problem. Even if it's just a pending dentist appointment.
Any thinking is optional, weird and not necessary. Once the thinking takes over, they will soon have a civilisation, recycling issues and whatever else they might happen to be thinking about.
"To be or not to be?" is never a relevant question. "What's going on and why I'm here?" is a better one. There aren't any answers to both of them, of course.