If you had lived their life, you would probably do the same.
Whenever someone does something that completely baffles you, remember that they are most likely responding to an old memory, or group of memories, that are very different from the ones you have.
Timid people LEARNED to be timid. Bold risk takers LEARNED to be bold. Responsible people LEARNED the value of being responsible. And airheads never learned to be anything else.
One of the great things about Life is that there is so much wondrous variety.
Embrace it. Enjoy it. Allow others to enjoy YOUR variety.
Affirm: I enjoy the incredible variety of people I meet.