Smokin' Joe wrote:
"Absence of a viable exit and escape strategy indicates either poor planning, failure to account for some factor (like smoke alarms pinpointing his location), poor execution, or the absence of desire to escape."
This guy had no intention of walking out of that room alive.
Although with all the obvious planning for his attack, it seems odd that he didn't "leave a manifesto" somewhere, a suicide note, something.
Perhaps he did, and the authorities have it, and are keeping quiet about its contents.
It's probably going to take another two-three days before "the wheat gets sorted from the chaff", before the facts come out and begin to line up.