Yes, until I realized that death would be too merciful a punishment for them.
I am pretty sure most people have fantasized of such things, at some point in time, rarely-if ever-does that mean any action will come of it.
This is why we cannot legally persecute someone for thought crimes, although some governments and police officials have come awfully close.
It's probably quite common and if you go back enough years people killed each other over territorial disputes or other simple things. We're all violent animals and have that inside of us. But these days you get locked away so it's not worth it.
More importantly you will have your name and face blasted all over the news and internet and your "victim(s)" will be initiated into sainthood-no matter how much you suffered and no matter how big of a piece of shit the deceased was.
It's really not worth it IMO, you're basically punishing yourself and turning the person you killed into an honorable idol-thus, they win, and you lose, yet again.
But I suppose immense pain can really numb the sense of inhibition and better judgement, just another reason why there should be a sanctioned and peaceful option for suicide.. if you trap a person in hell, they WILL become the devil.