@kakamoura:
He doesn't have to prove what he claimed. Let me explain why:
When the parents who don't vaccinate their kids defend their "right to their opinions", it is fully justifiable to demand they substantiate their claims with proof. That they cannot illustrates that they aren't coming from a place of evidence, but that rather their position is more of a belief system. The wealth of evidence debunking their position, yet their steadfast refusal to budge from that position, shows that their "opinion" is non-falsifiable, and therefore not in any way based on evidence (all of which is readily at hand).
There are many similar situations like the above example... conspiracy theorists or "deniers" often come to mind (Kennedy assassination, climate change, 9/11). To demand that the kooks prove their untenable position is fair game, because the bottom line is that there is a wealth of refuting evidence out there.
So you commonly see, in forums like this, when such a debate ignites, people like yourself demanding "proof". But this is not always appropriate or reasonable. Why? Not every subject has been as exhaustively researched and sources as the ones listed above. You want "scientific" proof of his position? How? He can't furnish a study if the study doesn't exist. So with the lack of "proof", does that mean that we simply can't address this, or any other subject where empirical personal observation is our only source of data? Of course not! That would be ridiculous. We'd never be able to talk about any subject (save a few thoroughly researched ones) if that was the requirement. "Is the bus taking longer than usual today? Since I don't have a comprehensive study as to the average wait time at this stop, I simply can't comment on the subject." That's absurd. If we have nothing but personal experience and observation to go by, it is ENTIRELY APPROPRIATE to voice our opinion based on that as long as we don't profess to be basing it on something more.
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