[from Facebook]
I disagree with the idea that their protections are others' protections [e.g. non-censorship of popular media]. There is overlap, but the WBC's actions are not the same as a controversial novel.
I see free speech not as an end in itself but as a means to further the public discourse; to make sure that ideas are given fair weight and not ruled out through force or other social principles that ultimately default to the threat of force (if you get evicted and refuse to go, the landlord can call in the cops - exercising force).
Following from that, I think it is reasonable to restrict speech which does not serve this purpose and which, on average, creates harm greater than the cost of prohibiting and punishing it.
Thus, I am okay with hate speech laws - one cannot advocate genocide or incite people to violence directly or through dehumanizing arguments (as dehumanization curtails empathy, which is a key step in inflicting mass violence) against a demographic of people defined by race, religion, nationality, sexual orientation and... a few other things I can't remember (but not gender or disability apparently, which is odd, but that's Canadian law for you). Through hate speech laws, we have removed "wholescale slaughter" from social consideration and will focus our cognitive engines elsewhere.
There are many other restrictions on free speech, ultimately backed by force, which I usually agree with (and which are generally considered intuitive, yet are not included in most discussions of free speech): uttering threats; breaching confidentiality; impersonating a police officer or other public official; identity theft; offering to pay someone to inflict harm; spreading malware; sexual harassment; giving false professional advice; following someone and shouting at them after they've asked you to leave them alone; breaking noise control ordinance; fraud; the old "shouting 'fire' in a crowded theatre" example; as well many other crimes even if one defines them as "performance art." All of these are crimes of communication, of speech or expression (they are "speech-acts"), and all, on average, contribute greater harm to society than a benefit that they would stand to create by furthering the public discourse. They have been ruled out of bounds. I am generally okay with that.
I don't think what the WBC does should be legal as it is harassment and hate speech and contributes nothing to the public discourse. But I don't mind that they get away with it - it does wonders for the public perception of homophobia.