Canada's David Warren raises an important distinction while defending Sarah Palin:

Candour is when you tell a truth that is disturbing, in language so unambiguous that persons in polite company will not want to hear you. It is a way to lose the respect of the genteel -- of those who are "respectable" in the shallowest sense. Rude language is quite unnecessary to this end: the hard truth itself, spoken plainly and publicly, will give sufficient offence.

Thuggery is unrelated to this. It consists not of candid argument but of naked intimidation. It may be done crassly -- for instance, by the union thugs who have begun to appear at U.S. townhall meetings, to confront opponents of the Democrats' health-care agenda. Or it may be done smoothly, with the politically correct gesture, that conveys the threat of later reprisal against anyone who utters the contrary, "incorrect" thought. A good example would be the "flag@whitehouse.gov" e-mail address that was set up on the official White House website, to which Obama supporters across the country were invited to report "fishy" opposition to that health-care agenda.