Why are the boys willing to kill a pig? How have their attitudes and behavior changed over time?

The boys are willing to kill a pig because they needed meat to eat instead of all the fruits and nuts they kept having to eat. Also they were probably so willing to kill the pig because they were no longer feeling like they were going to be rescued so if their going to be stranded on the island til` they die then they might as well eat well. Plus they probably just wanted Ralph to see that they actually went hunting and brought back something so he wouldn't have to worry about how they were going to eat with still being on the island.The attitudes and behavior of the boys has changed now because they all use to have hope that they might get rescued but now they seem to have given up hope, except for Ralph. Also at first Ralph was really excited and calm about being on an island without parental guidance, now he seems to really want to get rescued and go home. When Ralph found out about the fire going out and the ship not seeing it he seemed really stressed about it and he is also now stepping up and becoming more of a leader it seems. Jack has become more into wanting to hunt and seems to get really excited about it. The littleluns no longer seem as calm as they were before they want to go home as well. Piggy as well has changed he is more outspoken now and says how he feels.