Death to the Arts!

So I had occasion to peruse the National Endowment for the Arts website the other day, and was drawn to a bit of curiousness.

At the bottom of their donation page (apparently government organizations can accept tax-deductible donations from the public), it reads thusly:

Please note that mail sent to the Arts Endowment is frequently delayed due to security screening procedures, including irradiation. If you mail a contribution, please allow 3-4 weeks for a response.

Really? Irradiation? Are we afraid that terrorists are going to bomb/anthrax the National Endowment for the Arts? "Death to the Arts in America!"?

Look, terrorists. This is America. We're killing the arts just fine without your help, thank you very much.