I am not a lawyer, but that sounds like it would be straight-up murder. Murder is an unlawful killing, which by definition cannot be legally justified.
Further, responding to mere immorality with an initiation of physical force is a rights violation (and in the case of murder, a particularly heinous one at that). Rights violations are morally evil; the proper response to immorality which does not involve a rights violation is to socially shun the offender, perhaps publicly explaining why to persuade everyone else to do the same.
answered May 23 '12 at 01:47
Greg Perkins ♦♦