The deadly stabbing rampage Sunday in Tokyo's Akihabara district stunned the nation, but experts said the carnage was just another example of a young man unhappy with his lot in society.

Tomohiro Kato, a 25-year-old temporary worker at an auto parts factory in Shizuoka Prefecture, was arrested at the scene for allegedly stabbing seven people to death after running into a crowd of pedestrians with a rented truck.

This is the third major random killing or attack resulting in injury apparently perpetrated by a young man this year, following one in Shinagawa Ward, Tokyo, in January and another in Ibaraki Prefecture in March.