It has been uniformly accepted in Anglo-American jurisprudence that motive is neither an element of a crime, nor a defense to its existence.
CBIMINAL LAW--HUMANITARIAN MOTIVE AS A DEFENSE TO HOMICIDE--State v. Sander, (N.H. 1950).,
Mich. L. Rev.
Available at: https://repository.law.umich.edu/mlr/vol48/iss8/17