Well, nothing you
could call a motive. Apparently, he's just some nutty firebug. Off the
record, he spent a could of years at a mental hospital in the late '80s.
It's
always important to ask about a motive. If you get an answer you can use
it's often very important to your story. In this case, what will you do?
Can you call him a "nutty firebug?" You should not use off-the-record
info in your story.