No, I don't think any of that should be banned--but at least two of those members you quoted are trolls.  The other one I'm not so sure about.  And let's face it, a lot of people don't want to be living under Sharia law in their lifetimes.  That's what you get when you have a section devoted to politics and society--it gets very heated, and every racist comes out of the woodwork.

Trolling IS against the rules, but that's a huge gray area as to what constitutes trolling.  My suggestion is that if you don't like what someone writes, put them on ignore.  Problem solved.