The drama is entire towns being stranded and wiped out by pincers of fire.
Also the drama is smoke like the Kuwait oil field fires choking the west and killing the elderly etc.
Not lightening, global warming?
I don't mean to minimize the risk, other than the risk of being caught, which is minimal. Lots of damage, and if I'm right and you're wrong, it's only for the first occurance. By the third, we'd believe the terrorist's proclamations. It's missing the short term sizzle, but it's effective, and could have a cumulative effect similar to the bombers in Israel.
Aside from prairie or forest fires, urban arson could be a technique of terror. This block, that block, one dies here, four there, brings the risk home to all of us.