As far as having a use for it, well I suppose one could justify it either way. Fed say we don't have a use for semi auto rifles, but here I am on a Ar forum. As far as design, its primary use is for non lethal interaction with a target. It can also be used as a laser pointer, and a light. Think Laser Genetics ND series lights. The whole air plane thing doesn't have me worried. I usually don't find myself at the airport trying to bring down 747's. Just not my thing, not that I'm judging.