Because Jack is all about hunting and having fun and Ralph is about democracy and getting saved. Jack's group is living in the moment.
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It was a sort of appeasement to keep Jack from getting angry and starting his own tribe.
Because Jack wants to have fun and hunt and Ralph wants to build shelters and keep a signal fire going. The boys think that it will be more fun being with Jack
As "boys with sticks."
They have spears
The two reasons of why jacks group is more exciting than Ralph is because jacks tribe hunt and have a feast and have fun.
I'm sure Ralph is mentally scarred by all that has happened on the island, but because the book does not have an epilogue, there is no telling what Ralph and the rest of the boys do when they return home.
Because there scared of fast food