In general aviation, the focus tends to be about doing things right: proper procedures, precise flying, etc... Ultralight tends to be more about getting prepared in case things go wrong. In fact, more than half of my training was about dealing with engine failures.
I think the difference in training comes from the fact that crashes are more frequent with ultralight aircraft but they are also more survivable. A big part of it is that ultralight aircraft are lighter (duh) and can fly slow, which mean mush less energy to dissipate, and it matters a lot if you are going to crash into a forest.