Saying that people like Mladen Schwartz are simply exercising their right of free speech (in Croatia) is a bit naive at best, dysinformational at worst.
Likening Croatia's "tolerance" of Mladen Schwartz's racist rally, whose theme was "Jews out of Croatia," to America's First Amendment, when it is in effect a violation of Croatia's Constitution, Article 39 (which prohibits inciting racial or religious hatred, or any form or intolerance), and is therefore illegal, is hiding the fact that Croatia's racist past and present are out of character with modern European standards, is misleading, and represents true and transparent sophism on a much larger scale.
Our 1st Amendment did not give us freedom of speech. It merely recognized a pre-existing and inalienable right that is the birthright of all humans. Even Croats.
I could not care less whether the Croatian Constitution or that of any other European country does not recognize the right to freedom of speech. It exists anyway.
I recognize the power of certain countries to pass laws that punish speech they find offensive or to "prohibit inciting racial or religious hatred, or any form or intolerance." That doesn't mean they have the right to do so.
I am not sophistic in the least. My position is that of a believer in American values, not Croatian or EU ones. I realize his speech was illegal in Croatia. I just believe that the Croatian Constitution is wrong in this case.
I would not support any attempt to change their laws by force. But I also will not stand by and refuse to denounce laws that I believe, in common with the American tradition, are morally invalid.
BTW, I also recognize why, due to Croatian history, such laws are more tempting there than here. But that doesn't change their morality.