I don't think politicians are bothered about being "heckled" online. I suspect they are fully aware that, as long as they stay out of it, it's us mugs who spend our time "communicating" online, while they set the real-life rules that we all follow.

I used to strongly support the principles of free, uncensored, and anonymous online speech, but it never seems to actually provide any benefits. I now strongly believe that in-person social skills and networks are much more useful, when it comes to getting things done.