Community commitment means all members, not segregation by income.   The wealthy in are often at the forefront of community improvements, volunteer organizations and mentors to young professionals.

I don't think Brooks comments were only to the wealthy.   He talk about A wealthy person, and does not classify all wealthy people in the same way.  I have heard him kindly embrace the Gates foundation and the work of Warren Buffett.    

Brooks is making an appeal to the better angels in all of us.    As a Christian, the story of the woman with a single coin to contribute versus the more glorious tributes of the wealthy, rings a bell.   If God is used as surrogate for loving acceptance, then the size of the sacrifice matters, not the size of the contribution.

The poor are not inherently noble, the rich are not inherently greedy.   We are people, each with a unique background.  To judge by income alone is a mistake