Even the first rider can crash. The chance of it happening is just a lot smaller the further you move up the peleton. The guy in first can fall due to his own mistake or the rider behind him. The one in second place already has 50% more chance of falling because he can fall due to his own mistake, the rider behind him and the rider in front of him. If you ride in 10th position, there are basically 11 people that can make you crash. Of course not everyone can ride in front, and most GC contenders don't want too ride to far in front to save energy, so it's looking for the right balance. But if you fall more often than not, maybe you still haven't found that balance. This is just taking positioning into account, not bike handling, which is still a different matter.
PS: as far as upcoming Dutch talents go, i like Kruijswijk a lot. Saw him on Dutch tv this week, seems like he's got his things in order, down to earth, calm, focused...