Is Legalism a Just way of ruling? Why or why not?

I think it is based off what i’ve seen online because legalism was implied by the government and by a system of laws that gave out punishments and rewards for the behaviour of people :)

Britain and its empire stood alone against hitler and mussolini. in june 1941, hitler broke the non-aggression agreement with stalin and germany invaded the soviet union. in december, japan attacked the us and britain. the main lines of world war ii had formed.