I came to the conclusion as to why parents aren't scared of anything.

When I was little, I always thought my mom and dad were fearless. It wasn't until now that I realize nothing hurts more than a broken heart. In our lives, we cannot avoid having our hearts broken. We lose the ones we love all the time. They either walk out on you or are taken away. Once you experience that, nothing else in the world can hurt you as much. So, you aren't as scared to walk out into the pitch black night when you've gone to hell and back trying to fix your smashed up filthy ***** heart.