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I think it's an attempt to show that sociological theory of conflit society theorem introduced by Marx. Without dipping into my college educated sociological mindset, it basically says that society, and different factions of society, will always be in conflict with one another. So by both sides saying "we will kill them all" they are attempting to say that conflict is inevitable between "us" and "them" even though we often wish for peace. The same theory applies to say the upper and lower class in our own inner society (making them a subculture). The rich want to get richer and keep the poor, poor so that they can stay rich. The poor want to get rich but the only way to do so in a currency balleneced society is to eliminate intake from the rich. Thus conflict.

They got their weapons from all the Saudi Police forces that were "escorting" them before the crash. I also agree it is an excellent shooting scene. I would advise watching the whole movie. I think it contains a powerful message to those who are not sheep and see the need to fight those wish to do us harm. Bring the fight to them!