When I say a 'valid opinion' I mean an opinion that a person could reasonably hold without having the sole purpose of offending others or merely being argumentative. For example, I could have an opinion that the BNP are racist, which I do, however, that group could find my comment offensive and it would then be against the rules.
If I justifiably believe a group behaves in an immoral, unethical or objectionable way, these rules stop me from voicing that opinion because they allow punitive measures to be taken on the basis of 'offence' which is entirely subjective.
Quite simply I believe the rules are too vague and allow moderators to treat a commenter unfairly if they disagree with their opinion and hide it under the 'it's offensive or inappropriate' rule. I would like to see much clearer and defined rules and a way of redressing the unbalanced power of moderators and administrators by having greater transparency and a more impartial system to deal with infractions that are contested by the user.