The correct answer is: Albert Bandura
Albert Bandura ia a Canadian-born American psychologist and originator of social cognitive theory.
We can find this quote in his book "Social learning theory of agression "
"The massive threats to human welfare are generally brought about by deliberate acts of principle, rather than unrestrained acts of impulse. Is the principle resort to agression that is of greatest social concern but is most ignored in psycological theorizing and research".