You cannot use it as a link to justify murder.

I asked one of these guys, 'How can you justify murder?'

The film does not justify murder but offers a way to understand it from Caine's point of view - an uncomfortable place to be.

Islamic leaders in other countries, offended that he used Islam to justify murder, disavowed him.

What was there, more than that, to justify murder?

How does one justify murder and theft, after all?

What lies must this honorable man tell himself to justify murder?

Whether any of the grudges was strong enough to justify murder was another consideration he put on one side for the time being.

There is no crime that can justify murder.