Kano decided that rather than concentrate on the self-defense techniques he would instead concentrate on only those techniques that could be applied safely at full speed.
Therefore, when creating the art of Judo, he decided to not emphasize many of the killing and maiming techniques found in the original art of jujitsu. Kano decided that rather than concentrate on the self-defense techniques he would instead concentrate on only those techniques that could be applied safely at full speed.