@hawkeye10,
We don't know the person's intent.
Given flight attendants have some strong powers with passengers who mouth back at them (which I'm not against, though on my reading, sometimes that use has been misjudged), I have seen that some talk or acts are taken as some subset of terrorism, and I think misreading a non terrorist is as dangerous in some ways (liberty) as not reading a situation correctly that has serious intent. Well, no, the misreading of the real terrorist is the big problem. Still, in the land of fear much can be misjudged.
I don't mean by that paragraph that people get to start firecrackers. Or cause drunken brawls. But I've read about people dragged off planes for exclaiming to an attendant in a way I can understand.
On this perp, I'm guessing a mess of a person, what we might call sociopathic at least for now, but not an out and out terrorist.
I've four friends who were flight attendants, 3 for Pan Am/United. They had trouble with drunks back then.. and a lot of those drunks had lit cigarettes.