I've tripped several times in my life while walking. I've even hurt myself a few times. I don't go outside wincing to myself about whether I'm about to fall and hurt myself.
You choose the attitude you want to have in your life to disappointment and the attitude you bring to this site. You chose cynicism. You're going to crowd out people who don't make the same choice.
Your tripping example is incredibly patronizing.
I crashed my motorcycle years ago and have mild but still lifetime injuries. As a result, I've changed my behaviors and have put away my motorcycle. It's given me a place to reflect on what my own life is about, where I want to go, and the pain my family felt when they heard about the crash.
I choose the attitude of learning from the past and adjusting my behaviors.