I wouldn't call it evil. Yet, what you describe is certainly something, that needs treatment. Threats like that, shouldn't be taken lightly. Dialing 911, would be the proper step, as he's a threat to others.
Do you have, someone outside your family, in a position of authority, to reach out to? Counselor, for example?
This may require a bit in patient and anger management, for him.

Doesn't mean he's evil, he sounds like he has strong inner rage.