I'm thinking about your question Mporter.
I am one who assumes a statement is the opinion of the one making it unless an outside source is cited. And, as LW alluded, who is to say that a source is automatically any more knowledgeable or any better informed than A2K members are just because the source has something it has written posted on the internet?
(Personally, I think 90% of the media out there these days are woefully lacking in understanding of history, sociology, political science, logic, economics, and/or ethics.)
Having early on been severely chastised (with numerous uncomplimentary adjectives used) for expressing an opinion without identifying it as such and/or for citing a source without providing a link to that source, I learned that my preferred method of exchanging ideas, observations, etc. was not acceptable on A2K and I have attempted to conform to the rules of the road here.
I usually continue to assume a statement from another member is that member's opinion and overlook when that member fails to add the 'in my opinion' disclaimer. (If a statement is outrageously libelous, I will ask for a source.)
I usually find debate via copied and pasted sources or links tedious unless the source(s) are particularly pertinent to the discussion. Statistics, graphs, direct quotes are often useful. (I wish I knew how to post graphs, photos etc. That's something I need to learn.)
I figure if I put my opinion out there, it is fair game to be challenged, attacked, dissected, whatever. I resent very much when the thread is sidetracked to make me (or another member) the issue. The 'attack the messenger and not the message' method of debate is usually what causes tempers to flare so that things get ugly. Unfortunately, some don't seem to know how to avoid doing that or they just plain don't want to. I can't tell you how many times I've been called a liar here.
In this thread, the thesis is "Is GWB a fundamentalist Christian?" Those who see something sinister about fundamental Christianity and who dislike GWB generally say yes. That's their opinion.
Those of us who disagree with that opinion, will say no. He is not a fundamentalist Christian.
But you know what? Not one of us is able to get inside GWB's head to see what he sees, think what he thinks, know what he knows, or believe what he believes. It's all speculation. And we can post quotes from a bizillion other speculative sources and it will still be speculation just the same.