“Why would folks torch their own homes?” Muzzies! They burn their fellow countrymen’s homes for the same reason mooselimbs slaughter fellow mooselimbs with suicide bombings when trying to foment chaos ... Al Qaeda has been trying to generate a hate backlash against mooselimbs for decades, in the hope that worldwide chaos will pit mooselimbs against ALL infidels. Until Mecca is turned into a glass covered parking lot, they will continue because they are of their father, the father of lies a murderer from the start.
You're "preaching to the choir". (See my tagline.)
HOWEVER -- You both ignored my real point: multiple, simultaneous fires (at a near-identical stage of development) atop multiple high-rises are indicative of coordination and access that is not likely for an uncontrolled mob. The evidence points to something much more sophisticated than random violence -- as in government action.