I still think capital punishment should be brought back. Many people would still be alive today because a lot of the murderers would have thought twice before committing such crimes. With regard to the wrong person being put to death, I believe if you never commit any crime you should have nothing to worry about.
Besides, with todays technology and DNA results, it would be very unlikely the wrong person would be convicted of murder and the taxpayer would benefit long term also the prisons would be almost empty!