The news last month that police had arrested Sajid Badat at his home in Gloucester, England, shook many Britons. The charges against him concerned his training with al-Qaida in Afghanistan and his possessing PETN explosives, the same substance would-be shoe bomber Richard Reid had tried to set off. Police believe Badat intended to carry off the very first suicide bombing in the United Kingdom. But not everyone was shaken by this news. Gloucester's Muslim community esteemed Badat too much to credit the charges. One admirer called him "a walking angel" and "the bright star of our mosque." Another described him...