the right to exist of a genocidal people theme

The following dilemma is illustrated: Suppose a peoples engages in pathological killing and genocide; do they themselves then have the right to exist? Would we be morally justified in visiting genocide on them? Is there room for doubt?

Examples

In tng3x03 "The Survivors", should the 50 billion strong race of aggressive conquerers known as the Husnock be permitted to run amok around the galaxy? The all-powerful Douwd didn't think so and wiped them out of existence with a thought. Then he suffered grievous pangs of conscience.

3 total · 2 choice · 1 major

StoryLevelMotivation
tng3x03 choice Should the 50 billion strong race of aggressive conquerers know as the Husnock be permitted to run amok around the galaxy? The all-powerful Douwd didn't think so and wiped them out of existence in an instant.
tng5x23 choice Picard weighed the merits and demerits of exterminating the Borg.
tng5x04 major Should the murderous, but perhaps unique in the universe, spaceborne being known as the Crystalline Entity be allowed to exist?