For some, the death sentence might not be the worst to be afraid of. It might be worse to sit life long imprisoned. For others, death would be the worst

Death is inevitable, whether or not one fears it. Being mortal is the thing there is no escape from.

However, woth regards to punishment for a crime, I think it is not merely the concern of an individual's life. It has an affect on the society in multiple ways.

For instance, I read this post by terganftp. He mentioned of a case in which a convicted murderer of 6 women and probably more was punished with life time sentence. The amount spent on him during his imprisonment was 2.5 Million Dollar.

It's quite a big amount to spend on a convicted murderer and rapist collected from public's taxes. Doesn’t this money deserve a more productive use.

So, I think punishment should be decided based on the greater interest of humanity.