>>2087024/a/ can be very aggressive which is something not most people are used to. I think it can be said that while /a/ would allow everyone their view and opinion, but if you're to participate in discussion you are basically obliged to defend it and concede anything you believe to be wrong unless you can prove it somehow. It's their way to get as close to the truth as possible, I think.
Somehow I prefer reading /a/ or similar sites to more moderated, calm and unoffensive discussion groups.
