In 1977 and 1978 the National Socialist Party of America, a neo-Nazi organization, announced their intention to hold rallies in Skokie, Illinois. This town had the highest number of Jews per capita in the United States, so it wasn't suprising that the NSPA didn't get their permits. The case went to the Supreme Court, where it was determined that their right to assembly was indeed being violated. The announcement of their choice of where they were to rally was a deliberate provication, yet the ACLU took up their case. (The lead lawyer on the case was a Jew himself, as a side note.) This is one of the more provacative examples of the First Amendment's protection of unpopular ideals.
The Westboro Baptist Church of Topeka, Kansas has been picketing the funerals of soldiers ever since July 2005. They proclaim their doctrine of hate to grieving families whose children died defending their right to do this very thing. They are classified as a hate group by the Southern Poverty Law Center, alongside people like the KKK. They spend time and treasure traveling to spread pain and misery, protected by laws they seem to despise. Laws have been enacted all the way to the top to protect families from them; in 2006 President Bush signed the Respect for America's Fallen Heroes Act. As gman said; this is not the Christianity I know. That this group of citizens are within their legal rights does not mean that what they do is justice.
Fourtunatly, ordinary people are working to counter them and their shameful actions.
Bill O'Reilly said that he'd foot Snyder's bill if it comes to that, and the
Hell's Angels rallied in defense of the families, traveling to funerals (if invited) and "Shield[ing] the mourning family and friends from interruptions created by any protestor or group of protestors." To have so many people working both through legal means and outside the legal framework to counter them, rather than resorting to the sort of mob violence I personally feel might be justified (if just this once) is a testiment to not only the kind of pride and respect that humans can feel towards eachother, but also proof that the system
works, by Jove.
Tl;dr Comparing WBC to Nazis, people are cool for standing up against them.
(Does Godwin's Law apply to neo-Nazis?)