Support for free speech is generally tested at the margins -- everyone supports free speech for themselves, but the real challenge is to support free speech for your enemies. It is for this reason that I force myself not to get worked up about the American Nazi party adopting a highway in Oregon. LGF is wrong in this post to cheer the illegal removal of this sign. And a state government cannot be put in the position of screening out groups eligibility based on their political views - where would it stop?
Besides, since Nazis unfortunately don't seem to be going away, what better use for them than cleaning litter off of highways?