Black to white doesnt equal to evil to good.
Sometimes, people just hurt the others either on purpose or carelessly....which won t bother them since they don t even know what they do !!! Does that really mean they have no sin essentially?!
Parcival... the stupid man tried to become a Knight in middle age Germany, who was so naive that did so many silly things just because he thought of himself all the time. He only cared about the universe inside him. He saw nothing around him, besides him. Althought he was able to make up aferwards to those who had been hurt by him, however, what happened happened.