Size Matters
When someone with a bigger gun(s) ask you to do something, you do it. I'd expect that even the most colossally stupid could figure that one out.
I expect they chose to ignore the repeated warnings, probably in different many different languages over the hailer as well.
I wonder how far I'd get if I choose to ignore the local police on my little boat going high speed toward the Burj Al Arab?
Trigger happy....I don't think so, taking what means are necessary in a short time to protect oneself given the nature of terrorism I'd say those clowns were lucky to not have been blown into the next galaxy.