Cancer is far to mundane as is heart disease. AIDS, with its stigma of homosexual references, is far more viable as a media source, and thus get a rise out of the squeaky wheels who are vastly outnumbered by the silent majorities.
Talk about common sense and you will be ridiculed as a simpleton. Scream about the anguish of Herpes or AIDS and you will be cherished as a savior.
Squeaky wheels. As simple as that.
Let me add that the idea of an International TAX will be avidly supported by me as soon as all of the nations we have aided repay their past and present debts to the United States of America, in full, and immediately. Additionally, they should say the Pledge of Allegiance at every public gathering and must fly the Stars and Stripes. Until all of the members of the United Nations agree to this, then I am afraid, I will not support this or any International TAX, nor will I support any company or government official that endorses or submits to said tax.