Everyone should be on the side of justice. Those who would slaughter for profit or ideology are dangerous and justice doesn't take pleasure in executing murderers - it takes them out of society and makes them examples of why future psychopaths should avoid acting on their homicidal impulses.

You aren't going to be successful in trying to personify the justice system as individuals to be vilified, though you can work to change the system itself if you see the death penalty as injustice. Its a flawed system, there is much work to be done... though the practice of allowing wealthy and connected criminals to get away with anything they do has proven to be detrimental to us all. In my opinion justice should be blind to bank account or social connections, and dangerous people should be punished equally and decisively to ensure that their punishments act as deterrent and warning.