Continue to ignore this huge problem. You may be fine with eight men having as much wealth as half the world. I am not. We have people around the world trying to live on $2 a day, while these rich bastards do all they can to further enrich and empower themselves. It’s obscene.
It depends on how they got the wealth. This is where your argument needs to be more specific. I can't get behind an agenda that claims that merely having too much wealth is a crime. If the wealth is accrued through voluntary transactions, via people simply paying for the things they want and need, then any resulting income disparity is the will of the people, and should be honored as such.
If, on the other hand, wealth is the result of theft or fraud, or if it was amassed as a result of sweetheart deals with government - then yes, it is wrong and something should be done. I believe there are many, many examples of this that we can address. And if liberals focused on those cases, instead of promoting the general idea that it's wrong for someone to have "too much" money, they'd find real consensus with libertarians and (some) conservatives - enough to get real momentum for rooting out the corruption.