how he wants the boys to be safe?
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Jack quickly figures out that it is in his best interest that the boys believe there is a Beast. Although still a child, Jack realizes that fear is a strong motivator. Jack asserts himself a hunter and the only one that can protect the boys from the Beast. The Beast, as far as the boys are concerned, is an indiscript animal lurking somewhere. Simon's metaphor of the darkness inside man is lost on all of them. Jack's literal interpretation is enough to give the illusion of protection and complete power over the most of the boys.
Also, Jack wants to contribute his hunters to get meat. This is true to a point but is overshadowed by his creepy urge to kill.