Rather than just downvoting, I'll offer another perspective. Sowell's statement is vacuous, just a bumpersticker retort. Rather than engaging in the issue, it simply questions the motives of the opposite party and in fact dismisses their motives as one of the seven deadly sins.
I realize this is twitter and not a well developed thesis, but that just means twitter is a terrible platform to meaningfully engage in nuanced topics. It is a great platform for shallow thinking and insults, though, akin to the excuse, "I have a wonderful proof of this but the margin it too small to contain it."