Can Ethics Ever Change?

Ethics day at New Trier is the same every year. You get a long advisory where you eat bagels from Panera and talk about things you should and shouldn't do to make New Trier a better place. My question is whether or not you can change what someone thinks is the right thing to do. Ethics are usually first taught by your parents and family and that is when they become brainwashed. If you were taught as a child that the color red was a devil color, than you heard otherwise in your twenties, you will probably not change your mind. I don't think that the school can change what you think in one hour once a year.