The "world" was predisposed to turn on Israel. Any bad incident would do. As it happens, this one is probably a lie. It is just too convinient for this to happen ten years after the last Qana incident.
I don't disagree with you at all on the premise. But recall even members of the Arab world were 'concerned' over Hezbollah's aggressive actions up until this incident. Hezbollah needed/needs to bring the rest of the arab world on board. This incident will garner the arab street, it will garner the liberal street.
It won't matter what the truth is, for the truth will be called conspiracy and lies. Israel and America killed those children. The truth is but another zionist lie in the eyes of arabs.