Do we see a contradiction here? What is your true opinion: do multivitamins benefit some people (dieting down, crappy diet, elderly people) or as your first quote implied, it does not make a difference to ANYONE?
Funny you mentioned ZMA because its designed mainly for people who are deficient in Zinc etc (good sleep aid as well, if you want to be anal)... So does a multivitamin not help with people who are deficient in various nutrients?
Typical "science can't prove everything" arguement.
This is a good article on multivitamins
http://www.hsph.harvard.edu/nutritionsource/vitamins.html from the Harvard School of Public Health. Unlike your opinion, the artcle is fully referenced.