Watched this video, and unsurprisingly, some members of the Mercury Militia showed up in the comments.
If their propaganda tactics weren't causing so much harm to children, I could find them hilarious.
1) So many of them refer to thimerosal as mercury, it implies that they believe, against all of modern chemistry taught at grade school level and up, that an element and a compound containing that element are the same thing.
2) If they're claiming thimerosal breaks down, releasing the mercury, why can't I find one who's actually willing to crack open a high school chemistry book and use the tables in the back (or the same ones online) to calculate plausible breakdown reactions? Or even reference the work of someone who did that for them?
3) Even if it was mercury, isn't it kind of moot since mercury poisoning and autism produce very different symptoms?