Would it kill Japanese journalists to indulge in a little thoughtful speculation about the possible motive of Shinzo Abe’s assassin?

All I’ve read so far is that the shooter is in his early 40s, and that “local Japanese police said the handmade gun used in the shooting was more than a foot long and eight inches in height. They also said they seized several handmade guns in a search of the suspect’s home.” The handmade gun angle alone suggests a deranged killer, I realize, but is that all?