If you find Obama Bin Laden so offensive, I say you don't belong in a forum discussing politics.
It depends - calling the president "Obama bin Laden" is insulting, but is not a direct personal insult directed at a forum member. However, repeated use of the phrase for the purpose of inflaming other members is trolling, as hellhammer pointed out.
The PRSI forum doesn't need different rules, but its content is always going to require more careful assessment by both members (potential post-reporters) and moderators, since most of the topics are controversial by nature. A heated argument is not automatically going to be breaking the rules even if it becomes very tense. It's also possible for feelings to be hurt without any rules being broken, with the current thread perhaps being an example of that.