It most assuredly is not a myth that bodybuilders and strength athletes need lots of protein. Even the people who set up the food pyramid recongnize that. How much may be debatable but most nutrition experts don't dispute it.

To address the oft stated kidney issue:

Ann Intern Med 2003 Mar 18;138(6):460-7
The impact of protein intake on renal function decline in women with normal renal function or mild renal insufficiency.
Knight EL, Stampfer MJ, Hankinson SE, Spiegelman D, Curhan GC.

Int J Sport Nutr Exerc Metab 2000 Mar;10(1):28-38
Do regular high protein diets have potential health risks on kidney function in athletes?
Poortmans JR, Dellalieux O.

Int J Obes Relat Metab Disord 1999 Nov;23(11):1170-7
Changes in renal function during weight loss induced by high vs low-protein low-fat diets in overweight subjects.
Skov AR, Toubro S, Bulow J, Krabbe K, Parving HH, Astrup A.

Eur J Clin Nutr 1996 Nov;50(11):734-40
Effect of chronic dietary protein intake on the renal function in healthy subjects.
Brandle E, Sieberth HG, Hautmann RE.

Am J Kidney Dis 2003 Mar;41(3):580-7
Association of dietary protein intake and microalbuminuria in healthy adults: Third National Health and Nutrition Examination Survey. "Dietary protein intake was not associated with microalbuminuria in normotensive or nondiabetic persons."

Eur J Clin Nutr 1996 Nov;50(11):734-40
Effect of chronic dietary protein intake on the renal function in healthy subjects.
Brandle E, Sieberth HG, Hautmann RE.

The evidence supporting increased protein for bodybuilding, strenght athletes, and athletes in general is way to vast for me to get into.

As far as negative effects the only definite negative effect on other wise healthy persons with a longterm high protein intake (and I mean HIGH) is increased calcium leaching from bones, especially in older women. This is worse when the protein sources are pedominantly animal in origin.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.