It's interesting to watch the crowd as they wait for boarding to start. Narcissa and Draco are shunned like the plague, as are most of the rest of Slytherin; many parents were discovered to be Death Eaters during the I.C.W investigations, after all. Harry feels moderately bad that the children are being ostracized, but in truth, the now imprisoned Death Eaters were criminals and the past finally caught up to them. They made their choices and they’re facing the consequences; Harry just wishes it didn’t affect the next generation so deeply. All he can hope for is that they learn from the mistakes of their fathers and mothers, and make better choices for themselves.