The guy is Harry Bukhart and he seems like some crazy extremist - he said he hated America - and he's from Germany. Bukhart's damages are around U$ 3 millions; including, of course, Jim Morrison's destroyed house.
There were no more fires since Burkhart was arrasted and he's on court today, January. 4th.
I expect, as a Doors and Morrison fan, that this guy'd be punished for everything he did - since, there are more damages on the neighborhood caused by Bukhart's fires - and the Love Street could mean the greatest of them all, 'cause it's not just a house, but it's also a whole cultural legacy gave to us by Jim Morrison and Pamela Courson.
The video of the damaged house: