Well, I have to say that I've never seen any of what you mentioned...at least any that lasted. I had a comment recently with a relatively conservative slant get modded +5 relatively quickly and it's now at zero. Given enough time, conservative comments get weeded out on
/. because of the overwhelming liberal readership of this site. The sad thing is that it become an echo-chamber and most slashdotters end up thinking that the rest of the world thinks the same way that they do. Problem is, as the recent Presidential election proved, most of the country is much more center/right than it is left or even left/center.