EDIT: Yes, this is satire.
When you get a loaded gun like this that gets passed around, you don't get to control what the next holder of that gun does with it. Just because it is you or your buddy who would want to use it for a good cause (preventing anti-vax disinformation), doesn't mean that the next holder of the gun won't use it in a way you won't like.
And even then, that's assuming you do not believe that anti-vaxers should be allowed to publicly post their disinformation. I absolutely disagree with anti-vaxing, but I do believe in their right to post their info, just like i believe in their right to be publicly beaten into submission with overwhelming amounts of scientifically accurate information.
I don't support internet censorship, but I do support consistency of reasoning.