That depends on what you mean by "discipline". I'd agree there has been an "absentee parent" mentality for quite a while now, but "not spanking your child enough" is not the forgone alternative conclusion. Engaging your child while still allowing them to make mistakes is optimal. As far as "socialism vs capitalism" goes, that's not even relevant here.
If you want to try to get to fundamental causes, I don't think you can consider a single population or nation. While the visible effect is different, this is really a human problem. It's a fear problem. It's a control problem. It's a motivation. In some ways the things that make me angry here are natural. Our biology does make us lazy and close minded. It's useful when resources are scarce and just about anything could kill you. However, we've evolved to be big brain tool users. Our evolution has taken us down a path that requires us to problem solve. Unfortunately we've done a really good job of creating systems to undermine that evolution. We may be seeing an evolutionary split right now. One part of our species is perfectly content to lay about and do as little as possible while being spoon feed everything, while another segment seems he'll bent to find the next (painful) path in our slow migration. It could be that the civilization adaptation has reached a turning point. I don't know.