Walter Cranston's unspeakable principles actually came from his father, "Brian Cranston".
Before the resurgence of the Spiritual Tide, because of his Exotic Realm bloodline, Walter already possessed strength and speed attributes that crushed ordinary Origin Star Humans. After his first accidental release of power that almost killed a bully from his school, his father imposed this chain on him.
Even on his deathbed, the righteous-for-life Brian still demanded that he couldn't kill any "Origin Star Humans".
Brian insisted that his son could use any method to defeat criminals, Evil Transcendents, Extraordinary Creatures, etc., and deliver them to the authorities, but Walter Cranston could not have the right of judgement.
The bottom line, "cannot kill Origin Star Humans", must not be broken.
This is understandable, as Brian Cranston, being an ordinary resident, couldn't see the whole picture of the world.
