And to see himself become the villain.

Smallpox is not measles! But, point taken.

Nobody in Hn type circles wants to remember it because looking back with hindsight it was clearly just part of the theater to get people wringing their hands about whatever chemical or biological WMDs they alleged Saddam had and they killed the program as so as they got their invasion.

Wikipedia somehow makes it eve worse than that:

"The campaign ended early in June 2003, with only 38,257 civilian health care workers vaccinated, after several hospitals refused to participate due to the risk of the live virus infecting vulnerable patients and skepticism about the risks of an attack, and after over 50 heart complications were reported by the CDC."

Most people nowadays are not vaccinated against smallpox anymore

We don't vaccinate against smallpox, but keep in mind that at least two countries maintain live smallpox virus in government labs.

The bad actors are predictable. And I suspect at least two others are lying.

It really is eradicated - it's the only human disease we've truly eradicated. There are literally no more cases of smallpox in the wild, period.

The problem is that there are samples of viable virus in the labs of the US and Russia. So - it's eradicated but we have to keep stockpiles of vaccine around anyway. But nobody gets vaccined for it any more; it has an unfavorable risk-benefit ratio when the virus simply does not circulate. Smallpox kills ~30% of people who get infected with it; the first-generation vaccine had a mortality rate of about 1 in 1,000,000.

(There are newer-generation vaccines developed and being developed that have an even better safety profile but we still wouldn't use them because the cost - the literal cost and the side effects and general "meh, why get another shot?"-ness outweighs the benefit of protection against something you don't need protection against.)

Genghis Khan??

And it comes at a time when a disease we were working on eliminating, measles, has come back and the US is about to lose its measles-free status.

It sounds as if his legacy is to be unique, a feat never to be accomplished again.

  ...The program was ultimately unsuccessful in locating Osama bin Laden. It led to the arrest of a participating physician, Shakil Afridi, and was widely ridiculed as undermining public health.[2][3] The program is credited with increasing vaccine hesitancy in Pakistan[4][5][6][7] and a rise in violence against healthcare workers for being perceived as spies.[8] The rise in vaccine hesitancy following the program led to the re-emergence of polio in Pakistan, with Pakistan having by far the largest number of polio cases in the world by 2014.[8]

Norman Borlaug probably comes close. H. Trendley Dean was also impactful on a large scale, while its seemingly less important it helps a lot of people.