I think it was a good idea to banish Cole. Because he was a criminal for example: he started punching Peter with his bear fist then he smashed Peters head into the ground until he was down bloody. Another reason cole should go to the island because he can have some time to himself and Garvey said there was a spirit bear that could help Cole if he found it also Cole never really change all he wanted is to get out of the circle justice but him being bad was not all his fault because his parents don’t care really about him.