AP: Softening his tone, al-Qaida leader Osama bin Laden issued a humanitarian appeal on Saturday urging Muslim governments to do more to help Pakistan’s flood victims and expressing worry about climate change. It was his second purported audiotape in as many days. The less aggressive approach contrasted with al-Qaida’s previous calls for a violent response in what experts say could be a “good cop, bad cop” ploy to exploit anger over the flooding and rally support for the terror …