You're absolutely right. The ebb and flow goes like this:
for: we should draft Beanie because [reason A]
against: [reason A] is founded on questionable logic.
for: [offers no counter, moves to reason B]
against: Let's look at [reason B] in depth.
for: [offers no counter except for a highlight video] maybe this will change your mind
(someone who has not participated in the debate): after watching that, let's draft him! yes! please!
against: Dude, really? A highlight video? Haven't we discussed 50 million times why you can't fairly judge a player based on a highlight video??!?!
for: you just don't want him, that's all.
against: I'd be for him if our offense wasn't already potent. most of its problems are fixable from within. I just don't think this is the year to burn our only day 1 pick on offense.
for: beanie's a bruiser!
against: no, he's just big. he actually runs like a small back.
for: stiffarm! 235 pounds! 4.3 40!
against: he still runs like a smaller back. even OSU fans say as much. And he actually ran near a 4.4.
for: but he's 235 pounds. he can come in on third-and-1 and get the first.
against: that's not a 100% guarantee; he's a 235-pound guy who runs soft!!!
(then all the side discussions take place...)