The ends justify the means. IMO no... Thats your way, this my way
But remember the 1st episode. His plan is to kill criminals (who all people agreed they are criminals) with heart attack, then start killing people -who he doesnt like- with accidental deaths.
He is lying to public (covering some deaths) to gain followers.
Imagine all the anti-Kiras are gone. Then I bet he would start killing people for simplier things.