If he had a Gun it would have stayed in the headlines!

the 2nd floor of Happy Land: “The scene was paralyzing. We stood there numbed. No one spoke. There were 69 bodies spread about this 24x50 foot area.
http://www.crimelibrary.com/notorious_murders/mass/happyland/index_1.html

Happy Land Fire was an arson fire which killed 87
http://en.wikipedia.org/wiki/Happy_Land_Fire

Men who have dark souls & evil in their hearts will find a way, with about a about 1 gal. of gas this guy killed over 80 people, because his girl friend jilted him. All the laws in the world can not stop such acts, for man is inventive, & he will find a way.
Of course in England they might pass laws requiring serial numbers on gas cans, background checks on those purchasing gas, but regulation will not stop evil.