I don't understand why someone cannot walk out in a peaceful way that both sides understands. You tell the other person you've decided you don't want to work t

I don't understand why someone cannot walk out in a peaceful way that both sides understands. You tell the other person you've decided you don't want to work there, due to whatever reason, and in the interest of not wasting their time or effort it would make the most sense to stop the interview. Why would anyone take offense to this? I'd appreciate someone not wasting my time once they've made their decision...