Poor grandparent got nuked in the votes, but I actually think this is an interesting discussion. It ties to my thoughts about politeness and behavior on the internet, which ties to my thoughts about the same IRL. Dale Carnegie, "How to Win Friends" type stuff.
Is it effective to "hedge" your arguments/posts/words with a "now I might be wrong" / "you may know more about this than me" / "I'm not a lawyer" ? I spent 4 years hearing sales gurus tell me to not do it, exude confidence. Then I had Dale Carnegie and my favorite manager ever tell me the exact opposite. I've tried both, and the "Carnegie" method seems to work best for me both online and off.
It's not just "IANAL" - the most positive responses I've seen on reddit, twitter, and here have some sort of "hedge." When I employ it, I get great responses (and lots of upvotes, which is other than response rate and quality of responses the only measure we can really use). When I don't, I get downvotes.
Sometimes the "confident asshole" approach works here and on reddit, but it can backfire HORRIBLY - see the absolute nightmare situation happening over at ArenaNet - some guy didn't quite hedge in the right way and caused a total breakdown of community/developer trust. What a mess. I bet the developer wouldn't have felt quite so attacked if the commentor had hedged a bit better. See also, any email chain Linus Torvald gets involved in.
Now this just starts a whole other discussion about whether someone should "have to" hedge, etc etc. I'm just voicing my thoughts here, curious what others think.