You actually don't know if that what it "must be."
But we do know that your post was yet another gratuitous knock on New Yorkers - motivated, I'm sure, by a deep sense of charity.
I know for a fact what was reported in the article. If it is in error, then your problem is with the reporter.
"But we do know that your post was yet another gratuitous knock on New Yorkers- motivated, I'm sure, by a deep sense of charity."
Actually, it was motivated by a deep sympathy for the mother and the children, who I suspect are also New Yorkers.