Because you start running in circles and make imaginary rules. If 20 armed men came and congrogated infront of your building you just continue watching netflix, right?

If Im a civilian, then I would hide somewhere safe in my home.

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i asked if using force or threat of force could be used to contest a decision by a group if it considers itself targeted

Yes hezbollah was targetted by march 14 action (who started it all) so they used threat of force.

If march 14 now feels threatened, they could use force also but they bare responsibility for any consequences such as civilian damage, since they were the ones who initiated this whole thing in the first place.