Keep sounding the drums of fear

For several years now, my mother-in-law has been writing post cards (often as many as three or four a week) to the wounded GIs hospitalized at Walter Reed in an effort to demonstrate her support for our troops.

Yesterday, she received a letter from the government saying she must cease and desist because post cards are considered a security threat.

If post cards from a 78 year old woman, a Republican, a loyal Bush supporter are considered a security threat, what isn't a threat?