It all depends on who's willing to throw away the rights of the victim, and we know it's a criminal, and who's willing to throw away the rights of a criminal, if we're discussing about right to life. I'm not willing to do either of the two, and so is the European Union, which makes the abolition of capital punishment a prerequisite for entering States. Besides that it's quite easy to see why States separate their collective will from what a single citizen would like, whether these States apply death penalty or not, so the "me" point of view is irrelevant and has to be substituted by the "we the people" point of view.
I, for once, know for sure I'd be willing to kill someone with my own hands in certain circumstances, but I also know I have to repress it and live with the ugly sensation of seeing my bloodthirst forever unsatisfied. That's because I refuse the utilitarian positions defining a human life - whoever it is - as useless ballast, or as the life of an animal which has to be suppressed. I refuse to see life from a productive point of view. Moreover I'm unwilling to dehumanise someone just because he dehumanised someone else.
Dehumanisation is the key here, it removes the responsibility of having to deal with another human being. This mechanism has been used countless times to justify the most horrendous crimes. I can't understand why I would have to resort to something that would deny - first of all - my humanity. The first one losing something would be me. But allow me to hope to never have to prove my determination in this case.