Many of these deaths/accidents could have been easily avoided. Yet many people think Disneyland is the safest place on earth. It is quite the contrary. Watch this five minute video and see what we mean.
As a side note, Big Thunder Mountain is the deadliest ride at Disneyland with over 6 deaths. Many of the rides at Disneyland are super old and have not been maintained well. Usually they are but there is always room for human error.