I am for the death penalty in theory, because I think it's acceptable to kill people for certain crimes. In my opinion, there are some things that are beyond forgiveness and regardless of whether it will be a deterrent or if there can be rehabilitation, some crimes are just so horrible that if someone commits them they simply don't deserve to live.
However, I am against the death penalty in practice, because I don't think any government or authority should have the power to execute their own citizens, even if wrongful convictions and other flaws in the justice system weren't a factor.