@Foofie,
Violence or threats or vandalism is never excused for any reason. I was born in 1965, so I am not really familiar with the Vietnam era protest, from what I understand the protesters went way too far and so lost any moral high ground if they participated in any forms of violence or threats or vandalism.
However, those protesting in the Vietnam era were protesting something already going on, namely the senseless deaths on all sides of the unjustified war. If the protested in a civilized manner they were perfectly right to do so.
The threats and vandalism going on now is to disrupt even the debate/ discussion of having a health care reform bill so that people can not make an informed decision in those town hall meetings as to whether they would support it or not. If people have objections or other sides, of course their side should be heard, but that is the whole point, with all this mayhem, no information is getting out to be able to make an informed decision.