Justifiable

It was a case of clearly justifiable self-defense.

There's justifiable anger.

Did Raskolnikov commit a justifiable homicide?

Different jurisdictions often have distinct definitions of justifiable homicide.

It was a justifiable shooting.

I can only say that the crime for which we stand on trial to-day was justifiable, and needs no penalty to purge it.

Near-synonyms: defensible, excusable

It was at all times clear that, from the point of view of the idea it conveys to us, every motion must be considered only as a relative motion. Returning to the illustration we have frequently used of the embankment and the railway carriage, we can express the fact of the motion here taking place in the following two forms, both of which are equally justifiable: (a) The carriage is in motion relative to the embankment, (b) The embankment is in motion relative to the carriage. In (a) the embankment, in (b) the carriage, serves as the body of reference in our statement of the motion taking place. —

justifiable homicide