How long do you prescribe waiting to see about "long term" effects? 20 years? How many people will die from this disease in the intervening years?
What kind of long-term effects - what kind of risk - warrants waiting to see, and watching literally millions of people die? Put another way, how many other peoples' lives are less valuable than your risk certainty?
This is why I argue that these "personal choices" are mostly just about selfishness. Person A isn't willing to take the risk - any risk - of a negative side effect, because to Person A, his/her comfort/security is just more important than any negative impacts his/her "choice" may have on other people - even if it's lots of other people. Even if it's millions of other people.
Now, if it's Person A's spouse...then Person A might reconsider. (I personally know of suh a case). But it's too late for Person A's spouse - he's dead. Person A has to live with that. It seems to me to make much more sense - even if you don't give a hoot about strangers, no matter how many - to do what you can, up front, to protect your loved ones.
What's most aggravating to me is that this kind of denial - err, personal choice - seems to correlate very highly with tribe, with political affiliation. This suggests to me that it's not about anything rational, it's group loyalty. Game-playing, with one's own and other peoples' lives, for the sake of being "in the group," for the sake of opposing what the other group wants or thinks.
I'm left just shaking my head...