I think you have everything backways, and your analogy is incorrect.
When the Mythbusters thing first got announced (yesterday), everyone was happy. Check back a few pages, and there is a load of "OMG" and "WOW" style posts posted in this very thread. On Tested itself there was 500+ comments on the video with most people happy that Tested was working with the Mythbusters.
However, when the new site launched today, Adam and Jamie were doing a show of some kind. Will was recording Tested stuff and Norm was... I don't know. A video appears at the top of the site, with the Mythbusters using "our site" style language. Their names were everywhere, and Will and Norm is hardly mentioned anywhere. Don't forget that people love Tested because of Will and Norm. not just because it is Tested. Put all of that together, and it LOOKS like Will and Norm are getting pushed out. Looks,
It looked bad, and there was no one around to calm people down, so Twitter got vile, Tested comments got vile, comments on YouTube got vile, and Facebook got vile. A small percentage of people complained angrily a loudly (in the wrong direction), and another big percentage below them were a bit panicky - justifiably so IMO (as things looked bad)..
In a best case scenario, Will and Norm and the Mythbusters would have been running a live chat of some kind at the sites lauch, and then people would have seen there was nothing to worry about. People would have seen the four were working together, and everything looked good. Instead Adam/Jamie were everywhere, there was one new video from them, and they were the stars.
It is probably wrong for me to say it, but I still think people reacted in the right way to what they saw. There was enough factors in place to make them think something bad was happening to Tested, so they were right to complain, but yes, some people did take it to far.
It is good people have calmed now though - mostly.