There are. Suicide a much bigger problem than you think it is.
https://afsp.org/about-suicide/suicide-statistics/
Note those numbers only count our country. It's a huge problem world-wide.
Supposedly, the death penalty is a deterrent, but it hasn't proven to be so. A psychopath doesn't care about dying, and people who commit crimes of passion are so caught up in their emotion, such a threat not only isn't a deterrent, but may even be something they desire.