Your issue is with the government's right to enforce antitrust law, for which there is a long history showing why they should. http://en.wikipedia.org/wiki/Competition_law
The whole issue is not economic, it is philosophical, about ethics - i.e. what is moral and what rights people have.
Mr. Wu, with whom you agree, goes well beyond anti-trust. For him, as long as a business is considered essential to the public good, that alone is enough to justify "compulsion" (see your first quote). Do you agree with that? Or would you try to prove (as hard as that can be) that Facebook and Google are monopolies first?
You say "we should vote with our attention", and I fully agree. This is a proper way to make a change. Another would be to write articles like the one you've just written, using your own means. Compulsion should be reserved for criminals.