There seems to be a couple reasons the Robinsons are involved in a lot of accidents and they're all related to price. 1. They're about the lowest-priced helicopter available, so they don't have the systems and redundancy of more expensive helis. 2. Because of the price, they're attractive to new pilots with fewer hours and experience. And 3. They're ugly because they're cheap and god makes them fall out of the sky sometimes.
I hope this helps.