^^ Don't disagree. LEGALLY being the operative word in your point. Uttering threats of violence, doxing the dentists personal information and that of his family/employees, these are all crimes, and hundreds of people have committed them just at Yelp and Facebook alone. Making up false statements about poor dental service is fraudulent and bad enough, but direct threats of violence? Sorry, that's beyond "equal right to voice opinions". Same as it's his patients rights to not see him on moral grounds, it's his patients rights TO see him for the same, yet he's had to close shop due to the volume and level of threats made against him, his staff, his family, and even his patients who have tried to defend him on Yelp. That isn't hypocrisy, claiming that all the illegal threats and activity as "an equal right" certainly is though. I do agree that the age old "you shouldn't concern yourself with issue x or y, because 10,000 babies died of malnutrition or war today", isn't a valid argument on this issue or any other, but that's not what I said, or what I'm saying now.
Simply stated, uttering threats, posting personal information like addresses and contact information and recommending to others that they too contact and harass the target person/business/associates, then trying to excuse such behavior with a bunch of verbose theories regarding complicity, morals, rights, and hypocrisy, is lunacy.
People have the right to voice their displeasure, in all the LEGAL ways afforded them by law in the USA and the rest of the free world. It isn't "only opinion" that matters when some people choose to voice their opinion by making violent threats, and using lies/fraud to disrupt the business, which has nothing to do with the hunting issue whatsoever. Those calling for the prosecution of the hunting dentist, being such strong proponents of justice as they claim, should be calling for the prosecution as well of those threatening violence towards those associated with or defending the dentist too.