If you go over to the Politics forum, you can see plenty of people that have tons of lengthy posts. These are posts which have a lot of work put into them as they show people's political beliefs and exactly why they have them. They have links to back up their information and will be sure to defend their own beliefs and correct anyone who has made an error. You just do not see a lot of that on the General forums.
Honestly, they have things that are literally paragraphs long, not to mention there are responses that analyze and respond to every part of said paragraph.