Assuming the boys are going to be on the island for a long time. Why was killing the sow a stupid thing to do?

I'm not quite sure I understand what you are asking. The boys all agree that if they're stranded for a long time they'll need meat. If there's one sow..... there's sure to be more. The main conflict in this chapter is priorities and if those priorities are being addressed by the group as a whole.

Please use kinder words. It hurts the index of the website.