Unfortunately the Americans have yet to learn the lessons of Europe in the 60's / 70's / 80's / 90's... We lived with the threat of terrorism from the IRA, Baader Mienhof, PLO and Brigado Rosso et al. If you let these people change your way of life then they have won. Life must continue as close to possible as normal.
Good lord, the guy was breaking the law, said he was trying to light his shoes on fire. Those on the scene make a decision to detain the man given his actions and statements. He was later released. Life did continue as close to possible as normal.
Don't be a bunch of drama queens. Don't extrapolate anything to some larger context.
He broke the law if the reports are true. That of itself should cause the detention even if the yahoo was from Des Moines let alone elsewhere.