It's not your fault for having it.

It's the administration's fault for not allowing it.

Ever hear the saying "ignorance of the law is no excuse"?

http://www.tsa.gov/public/display?theme=177

Partial quote: "Prohibited items are weapons, explosives, incendiaries, and
include items that are seemingly harmless but may be used as weapons - the
so-called "dual use" items. You may not bring these items to security
checkpoints without authorization....

If you bring a prohibited item to the checkpoint you may be criminally and/or
civilly prosecuted or at the least asked to rid yourself of the item. A
screener and/or Law Enforcement Officer will make this determination depending
on what the item is and the circumstances. This is because bringing a
prohibited item to a security checkpoint - even accidentally - is illegal.

(tough love, baby...and though I'm with those who say he administration's
running roughshod over civil rights, there's been enough publicity that anybody
going to fly commercial could find their way to the site and peruse the
prohibited items. It's actually amazing what you CAN carry, in checked luggage)