Michael Moore ain't that smart if he really thinks that ex-US military dissidemts are going to fly suicide missions
And in effect wasn't that exactly what the veteran Timothy McVeigh did, except that he used a truck instead of a plane? Didn't even make any serious attempt to get away. Refused to appeal. Dying was part of it for him.
Whoever was responsible this time, the possibility of it being a home-grown effort next time had better be kept in mind by whoever they put in charge of security arrangements.