Lucius wasn't the sort of father who tucked his child into bed with a story and a kiss on the forehead. In fact, the only times that Draco remembered his father touching him was in order to beat him. Lucius" hands only ever doled out pain and never comfort. It was Lucius’ paternal attention that taught Draco at a young age that the world was unfair and often violent. If he expected violence then nothing would ever surprise him. He couldn’t necessarily escape the expected violence, but expecting it meant that he could prepare for it. At least in theory.