At the point where these crimes are being committed the last thing on these perps mind is the punishment they would suffer if they were caught. Basically while doing the crime there is absolutely no thought of consequence - they are 'living' in the moment of whatever heinous deed they are committing - don't misunderstand me - the death penalty is not a deterrent, it is a punishment - the ultimate one for people who no longer deserve the protections and rights of our society.
The death penalty guarantees that a perp who is caught will never commit that crime again - and that is good enough for me - weed the *****ers out of the gene pool.
To be honest, I'm not sure how much worse it can get here (outside of actual warfare)