You know, there are legitimate answers to that strawmanish question. Why would you say something ridiculous like that, which just begs the further response, "Well, then we better not release such monsters at all..."

Careful — increasing the number of capital crimes, and actually executing criminals, would do that as well, as would imposing more life sentences.

increasing the number of capital crimes might actually to increase the number of murders. If you are committing a capital crime, you have a strong incentive to get rid of the witnesses.

I’ve heard very few people arguing to expand the list of capital crimes. After all, California hasn’t even executed more than 700 people on death row, let alone all the other first degree murderers who could be executed without any expansion in the list of capital crimes.