Warren Buffett's philanthropic pledge

Was reading Warren Buffett's philanthropic pledge in the latest Fortune and the following passage stood out.

My luck was accentuated by my living in a market system that sometimes produces distorted results, though overall it serves our country well. I've worked in an economy that rewards someone who saves the life of others on the battlefield with a medal, rewards a great teacher with thank-you notes from parents, but rewards those who can detect the mispricing of securities with sums reaching into billions. In short, fate's distribution of long straws is wildly capricious.

Yes, I know it is great that Buffett and The Gates (Bill and Miranda) are asking wealthy Americans to pledge 50% of their wealth to charity. But for me, it is grave unfairness of the haunting truth of the above statement that needs attention. This, if anything, is what I hope to leave with you today.