Here's a conspiracy theory for you.
If you're a child, you can get a flu shot. If you parent small children, you can probably get a flu shot. If you're over 65 you can get a flu shot.
But - and here's the thing - if you're aged 50 to 65 you probably CANNOT get a flu shot.
This means that the baby-boomers had better watch out. If they succeed in infecting us with the flu and we all get sick and die, Social Security is saved and a lot of really good jobs open up.
There you have it: Motive and opportunity.
Watch my back, will you?