If this is what I saw on TV earlier, I'm not sure the explosion was entirely the guys fault. I mean, it was clearly his fault but I don't know that he planned such a massive explosion. There seems to have been a gas leak in the building of which he could have been unaware...
Still, there are much better ways to commit suicide than THAT. Or, if you must blow yourself up, have the common decency to do it outside away from people, or, failing that, an old abandoned warehouse which is going to be torn down anyway.