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if you love your home but don't have any more fundamental reason for fighting there's no war.

Grotius' theory of Just War holds that self-defense against an invader is justification for the use of force.

[Non-Sequitur]

Grotius' theory of Just War holds that self-defense against an invader is justification for the use of force.

But Grotius did not consider a rebellion to be a Just War.