Coming from someone clearly as well informed as are you, such praise is flattering indeed.
"... there is only a 20% chance of the "Flu Shot" doing any good."
I reckon that's pretty optimistic. I saw a stat recently that of the hundreds of thousands of samples taken from folks diagnosed with the flu and sent off to the CDC to be analyzed, only 16% turned out to be flu. On top of that, vaccines don't work perfectly, and even if they're pointed at the right target, also are likely to harm about 10% of folks that get them.
Being cynical is the smart course with these folks IMHO.
Thanks!