Targeting young people as his main goal is the worst thing about it, and the numbers of people he managed to kill before anyone reached the island will be very hard for anyone to deal with for quite some time. This was extremely well planned and I don't think there was anything anyone could have done to know about or prevent this from happening. He was clearly working alone. Also to create such a large bomb purely to distract the country whilst he went to the island shows you he doesn't have any consideration for the lives of others.

His lawyer was just being interviewed on the news and he clearly stated that he thinks he is insane. He stated that he believes in his own mind that he is fighting a war. When the lawyer was "how is he acting and communicating in prison" he said he is unable to say as he has never met anyone like this before.