If they didn't make statements like that(which they do all the time, remember SARS?) then you would never hear about them.
And nothing would be done. It is a game of "Cry Wolf" where you need to do it to get any funding to work with the problems that are real(and just general funding to run the program). And you have to "Cry Wolf" to get the funding, in the end, it will probably bite them, but that is what they are doing.
What is that i'm hearing, uh, a branch broke THERE IS A WOLF.
Oh, i guess not anyways, just a deer.
What is that i'm hearing, uh, a branch broke THERE IS A WOLF.
oh, i guess not anyways, just a cow.
etc.
Of course, i may be pesimistic.
Contractable Disease:
300,000,000+ - Smallpox (20th Century)
200,000,000 - Black Death (worldwide, 1300s)
100,000,000 - Plague of Justinian (Europe 540-590) (disputed)
10,000,000 - 100,000,000 - deaths from diseases in Europe (millions) and the Americas (tens of millions) from diseases exchanged between continents after 1492
50,000,000 - Spanish Flu (worldwide, 1918 - 1919)
19,000,000 - AIDS (worldwide, 1981 - )
10,000,000 - Bubonic Plague (China, 1892 - 1896)
5,000,000 - Antonine Plague Roman Empire 165 - 180
4,000,000 - Asian Flu pandemic (worldwide, 1957)
1,000,000 - Hong Kong Flu pandemic (worldwide, 1968)
130,000 - North American smallpox epidemic (1775 - 1782)
60,000 - Great Plague of London (1665)
775 - Severe Acute Respiratory Syndrome (SARS) (Mostly East Asia, few cases in Europe, Canada and United States, 2002-2003)
677 - West Nile Virus outbreak (North America, 1999 - 2004)
Honestly, as far as contractable diseases go, I think really prefer a 'cry wolf' as opposed to the alternative. As far as the fear tactics, well... I suppose there are worse things to make people afraid of...