I could never work for a prosecutor. I want to be a defense attorney because I believe in that cause. I respect prosecutors and understand that some of what they do is necessary, but its not for me.
Funny, because that's almost exactly the way I feel about defense practice.
I have the utmost respect for many members of the defense bar, and I believe they perform an essential function in the system of criminal justice. I'm just more comfortable on the other side of the bar.
Interestingly enough, I know a few defense attorneys more enamored of capital punishment, for example, than I am (I have always been against it, for numerous reasons). And my first supervisor on the Trial Team was literally a card-carrying member of the ACLU.
Both sides serve important functions, but I think most people gravitate toward one or the other as being where they, personally, are the most comfortable. I believe in a good defense, but would make a lousy defense attorney because my heart would not be in it. Same with many defense attorneys, who believe in the notion that vigorous prosecution of criminal offenses is necessary, but they prefer to be on the side looking out for the accused. Nothing wrong with that. If you do what feels right to you, you will do a better job.