I think Cole banishment is a good idea,because he needs to figure out what he is.Plus he also needs to think about joining circle justice and if he actually wants to join it.or if he just wants a sponsor form circle justice and he doesn’t even care about want he did. Cole dad was abusing Cole when hes drunk, and he’s Mom just a pretty lady who just does nothing when Cole gets beat up by his dad.Plus Garvey was a native tinglet and he made the idea of sending Cole into the island.plus Garvey knows what would happen if he hand’t sent Cole to the island ,Cole dad would beat him up, and Cole would do more bad things.Garvey wants Cole to go to the island because he wants him to see the good side of the island and of the challenges about the island Garvey knows that Cole won’t escape the island.Cole tried to  escape the island at night,but at night the gravitational atteration causes the moon to move the water the other way.so when Cole was trying to escape he basically got pushed away every time he swam.Garvey probably knew that would happen,Thats why it’s a good idea to and Cole to an island to get some peace and calmness these are some quotes when cole went to the island

food is energy and energy is life

anger is never a memory to be forgotten