William J. Brennan,
New York Times v. Sullivan (376 U.S. 254…
“ A rule compelling the critic of official conduct to guarantee the truth of all his factual assertions — and to do so on pain of libel judgments virtually unlimited in amount — leads to a comparable "self-censorship." Allowance of the defense of truth, with the burden of proving it on the defendant, does not mean that only false speech will be deterred. ”
