Legal repurcussions? what I'd like to know is how many times has this "do good not evil" phrase in a license actually come up in court or been tested by lawyers? Probably never.
If it ever actually ends up in court it has had far more than a single repercussion. Mere legal threats, or even the possibility of them, can seriously get in the way of productivity.
Yes, it's stupid, and we should all lighten up and be able to laugh about it. We should also be able to laugh at obvious jokes about having weapons at an airport.
There are some really unfunny people in this world, and in the meantime we unfortunately have to just deal with it.