We need them.
to test ourselves,
to level up,
perhaps most importantly: to distract ourselves from pettier things.
Hardship has a preternatural ability to bring people together. As soon as the earthquake hits, or a loved one gets cancer, our quibbles and differences fall by the wayside.
When life returns to normal we start arguing again.
During these times it serves us to find a challenge worth facing. To find a tribe with a common goal. A purpose to drive us to become better.
Because we humans thrive on challenges.
Sometimes they find us.
The rest of the time, we make them up on our own.