Their plan is to return the entire world - not just the Middle East - to the days of the caliphate and either convert all of us so-called infidels into born-again Islamic believers or kill us.
An action doesn't have to be wrong just because it is not logical. It doesn't have to be right just because it has its logic.
One of the key issues will be personal honour vs. the good of the many, and unforeseen consequences.

