@Builder,
Builder wrote:A crazy man? Or a man motivated by outside influence?
Nobody knows, so far. The police are saying he acted alone, and say it is possible "we will never understand why he did this". Stories are emerging that he went on 72-hour alcohol and crack binges with prostitutes, robbed drug pushers at knife point, mocked Islam, which doesn't sound very "radical", so it is possible that he hatched the idea all by himself. You might count TV news as an "outside influence", I suppose.