Both can be true that Leaders can use god to justify their terrible actions and Scientists can use theories/philosophies to justify their terrible actions too.
Justification of any evil action to consider oneself as a good guy might be a human quality.
That being said, Majority of wars/conflicts in the past have sadly been because of religions and that number doesn't seem to be stopping and is still continuing to this day sadly.
Both can be true that Leaders can use god to justify their terrible actions and Scientists can use theories/philosophies to justify their terrible actions too.
Justification of any evil action to consider oneself as a good guy might be a human quality.
That being said, Majority of wars/conflicts in the past have sadly been because of religions and that number doesn't seem to be stopping and is still continuing to this day sadly.