I personally think they don't give a duck about or personal safety whatsoever. They are just too concerned for truth to come out to the surface. He is using his platform to convey his own observations and people are free to choose who to believe, if they are so scared that so many people will believe what that doctor has to say, that means they are not so credible to begin with.
Oh trust me, I wasn't talking about my freedom of speech. As I said in my other comments. I was talking about restricting some people's freedom of speech, such as removing Dr. Daniel Erickson's video from Youtube discreetly. I can give you many examples don't worry ^^