Surely you jest Duke.
In the US you can 'legally' express almost* any feeling or attitude, however there are numerous cases of people suffering physical abuse and threats for having expressed their opinion.
Law only means that retribution will be dealt on the offender (occasionally) - it does not prevent occurence of the offence.
Eg There are laws against murder, but people still get murdered.
*Thus, in the landmark decision in Brandenburg v. Ohio, 395 U.S. 444 (1969), the U.S. Supreme Court held unanimously that "the constitutional guarantees of free speech and free press do not permit a State to forbid or proscribe advocacy of the use of force or of law violation except where such advocacy is directed to inciting or producing imminent lawless actions and is likely to incite or produce that action." Id. at 447 (footnote omitted). Because this test requires proof of both an intent and a likelihood that the speech will incite imminent unlawful action, there has never been a case in which the mere publication of written materials was found to be a punishable incitement offense. Rather, Brandenburg's rule permitting prosecution has typically been applied in cases where a speaker urges an already agitated mob to commit illegal acts (such as assault on a passing victim).
Excerpt from http://www.usdoj.gov/criminal/cybercrime/racismun.htm