Don,
Obviously, neither I nor any other average white American can do much of anything to fight discrimination in the work place. However, if I had Palmer's wealth, you can bet I would be much more outspoken about things, including the way blacks are routinely favored over whites for roster spots and playing time in the NFL. I would absolutely never seek out a T.O. to work out with on my own, and then urge the team to sign him.
However, I also don't fawn over and excuse the misbehavior of blacks that I work with. I try to be fair with everyone, but never favor blacks just to score brownie points with uppper management.
I think Brown has the most impact on the makeup of the Bengals' roster, but Lewis has the magical race card, and can trump him if he ever decides to play it. With Brown's clear affinity for "problem" blacks, that probably won't ever be necessary. Palmer would have little or no impact, if he opted to recommend a deserving white player to the team, but his own gullibility can be used by the team, as it was here, to make the signing of a problem child like T.O. more palatable. As Kornheiser and Wilbon stated, Palmer's support was crucial and made the addition of T.O. a "safe" move by the Bengals.
The primary reason even the most race conscious whites don't speak out is because they fear financial ruin for doing so. Palmer, like all established pro athletes, doesn't have to worry about that. Still, I'm not suggesting he do anything like that; on the contrary, as you note, he probably is as in love with "diversity" as any of his white peers. I just don't think he had to do something that resulted in the signing of Owens, which negatively impacted the chances of two of the rare white receivers in the league.