I heard this, and the context was a caller who said that if abortion hadn't resulted in millions of children not being born over the past 32 years, we'd have many more people working, paying taxes, and it would be easier to adequately fund social security. Bennett said that a problem with that argument was that not every child born would have been in a position to make equivalent contributions. He asked, how many abortions occur among single mothers, or among people in poverty; implying, I guess, that they would be more likely to be unemployed than gainfully employed and contributing. Then he asked, sort of rhetorically, if you aborted all the black babies, would that result in a decrease in crime. A poor choice of words and poor example, but then Bennett does go off on tangents sometimes.
I posted the call above. If he had stated it as a rhetorical question it would have sounded much better. But his statement as it is a matter of fact, makes it kind of dicey.