Regarding 2, I think the default setting (Popular) is to display comments as a function of karma and time since posting. As comments get old, newer comments float to the top even if the older ones have some positive karma. If some comment has very high karma, I guess it outweighs the time constraint and stays at the top.
It reminds me very much of this quote attributed to Gautam Buddha:
"Believe nothing merely because you have been told it. Do not believe what your teacher tells you merely out of respect for the teacher. But whatsoever, after due examination and analysis, you find to be kind, conducive to the good, the benefit, the welfare of all beings -- that doctrine believe and cling to, and take it as your guide."
Related post and discussion over at OB - http://www.overcomingbias.com/2009/06/lazy-hurt-less-than-stupid.html
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-- pg