I think you can disagree with some choices of your idol's. If he does something stupid, you aren't compelled to defend him to death - as you say, it's not someone we know or our brother, and anyway if necessary you'd scold your relatives or friends if they did something wrong, right? But there's a subtle difference between disagreeing with some choices and complaining for trivial facts. Let's be serious: he's performing for you for 3 hours (and a 3-hour-concert is really something, most of western artists wouldn't do it), he's giving all himself to you on stage, and you send a complaint letter to the fanclub because he wasn't wearing sunglasses...?! It's absurd O___o Or when they scolded him because he took some weight during 2010...? it's not that he suddenly became obese, it wasn't necessary to write to the fanclub/radio/ magazines to tell him to lose weight! Or saying that he should never have his hair permed ever again. These are trivial facts that are totally useless and non influential to his character, behaviour or career; the only result is just hurting him - because I bet that Kame The Perfectionist took all those complaints deadly seriously, just think at how many times he apologised (!!!!!) for putting on some weight for the HR project. This is just playing the spoiled fan, without keeping in mind that he's still human, and without looking at what the artist behind those sunglasses-kilos-hair wants to convey. This is what I meant with "you're supposed to support him" - as an artist making his choices on stage. You may prefer the "cool show off Kamenashi" over the "weird Kamenashi", of course; but you can't boo him every time he's a little different from your expectations. You aren't showing maturity as person either.
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But there's a subtle difference between disagreeing with some choices and complaining for trivial facts. Let's be serious: he's performing for you for 3 hours (and a 3-hour-concert is really something, most of western artists wouldn't do it), he's giving all himself to you on stage, and you send a complaint letter to the fanclub because he wasn't wearing sunglasses...?! It's absurd O___o Or when they scolded him because he took some weight during 2010...? it's not that he suddenly became obese, it wasn't necessary to write to the fanclub/radio/ magazines to tell him to lose weight! Or saying that he should never have his hair permed ever again. These are trivial facts that are totally useless and non influential to his character, behaviour or career; the only result is just hurting him - because I bet that Kame The Perfectionist took all those complaints deadly seriously, just think at how many times he apologised (!!!!!) for putting on some weight for the HR project. This is just playing the spoiled fan, without keeping in mind that he's still human, and without looking at what the artist behind those sunglasses-kilos-hair wants to convey. This is what I meant with "you're supposed to support him" - as an artist making his choices on stage.
You may prefer the "cool show off Kamenashi" over the "weird Kamenashi", of course; but you can't boo him every time he's a little different from your expectations. You aren't showing maturity as person either.
/end of long rant, sorry xD