Obviously, just like they may not share your opinion. They are supposed to be as objective as possible (while still following the rules).
They may as well not share my point of view, of course.
Your point is...?
Of course the "very clear" cases are quite rare, and there are many gray zones. Again, this is up to the moderator to decide.
Well, the problem is, mods are human after all, too - it is just not easy to tell a mod that his judgement was wrong in a thread that has been locked... on a forum that doesn't allow criticising mods...
I will also admit to having made judgemental mistakes (I am only human after all), but if I am proven wrong I will accept that I was wrong and apologize. I have however never done it for the sole reason of someone disagreeing with me.
Maybe not for this reason alone, but you did it for personal dislikes.
That balance is once again up to the moderators, but they still have to follow and enforce the rules. That is their purpose.
I am a fan of rules, they make your life much easier (you don't have to judge yourself what is still ok and what is not) - enforcing the rules is absolutely ok, too - the difficulty is just to find a set of fair rules, and while a rule may be 100% accurate in most cases, there will be exceptions... and the rules can't cover them all.
However, running a forum is not a charity thing (most people tend to forget that), they are, and that's top priority, subject to financial interests. And this is where the problem starts:
A thread may not only be ok, netiquette-wise, yes even needed, as i.e. MA does indeed NEED the feedback (including negative statements, even you will agree here), and it may
still be locked because it runs contrary to the owners financial interests (i.e. in discouraging new players, or devaluating the ingame assets of the forum staff).