You'll are a depressing lot.
You would not have wanted shares in multichoice before and you probably couldn't have cared for them. Now all of a sudden because you're told you can't have them it's a problem.
Just because people don't want them doesn't mean they don't want the opportunity to have them. As tibby said, it was wrong that under apartheid certain groups of people couldn't own shares, just as this is wrong now.
Black people are more than 70% of the population yet they own less than 5% of the economy. That isn't fair and there's no easy way to fix it.
Call it racism, cal it what you want, but something must be done about it. It is not to be left to the kindness of those who have economic power to settle the matter because it would take too long or just wouldn't happen at all.
No there isn't an easy way to fix it, which is why "easy" options like this won't work.
Not banking with Nedbank is not going to harm anyone but you and you are not going to prove a point.
It may be racist, but so what? That you can't buy shares from multichoice is not gong to stop you from going to work, it won't stop you from waking up in the morning, in fact it has nothing to do with you. Chances are you were never going to want shares there anyway.
Clearly principles mean nothing to you. And as you yourself said white people still control a significant portion of the cash and assets in this country so if a lot of them stopped banking with Nedbank I can promise you it would harm them. Ever heard of a slippery slope?