Forcing an opinion on an internet site is impossible. Nobody forces the reader to do anything.
For me the appeal of sites like this is the opportunity to hear a vast range of perspectives on a wide range of issues. The Internet is not suited to those of frail disposition or the easily offended.
However sites like this frequently become dominated by a clique who only want to hear their own values reinforced by others. They are the easily offended and lean the moderation of the site towards regarding anything that might offend anyone as coming from a problem user.
Those who don't conform either get banned or leave because they are made to feel so unwelcome. Then the user base collapses to a bunch of boring people who don't have much to say.
For a good example have a look at:
http://www.cerescape.com
I was considered a radical as was another user who had strong rightwing beliefs which almost always conflicted with mine. We and several other wrote passionately and supported the right of all to express themselves openly regardless of perspective.
This once vibrant site was abandonned by the controversial posters because they were being treated like trolls and getting suspended for the mose inane reasons.
Conservatives left because they got offended. Religious people left because they didn't want to hear well constructed arguments exposing the dark side of religion and its negative consequences on our society.
The cultural control became obvious after Chatterbank's demise. Several CB users turned up and were criticised for being too trivial and bloggy. Yet some of them had a lot to offer the site.