Yeah I'll admit there are quite a few flaws. I just feel there's a real issue here with more impressionable authors who feel unsure of their own knowledge, not knowing what advice to follow when they're told contradictory things. Or maybe there should be a way to comment on comments. That would just seem a bit less like you were trying to start an argument, in my view, if there was an official way to do it. 
I agree - when you first join it can be very confusing when you receive contradictory comments. But you have to remember that any comment is just someone else’s opinion. There is no right or wrong, just different outlooks. People are bound to disagree from time to time, but it's only the minority that will see creative difference as an argument (I hope).