I'm not. Hunting people in a safe democratic society isn't "romantic", it's not "The Most Dangerous Game" or anything else. Your analogy is absolutely accurate. Harvesting an oyster would be another. Still totally hunting (or maybe just gathering).
> the rest of their lives
Only if any of their adversaries survive with sufficient will to fight.
All of this is besides the central point, which is that a killer would likely be on the run from detectives and maybe PIs for the rest of their lives.