Hmmmm ... Not according to the National Highway Traffic Safety Administration (NHTSA). In a July, 1972 report of its two-year investigation of the 1960-1963 Corvair, it found that "The handling and stability performance of the 1960-1963 Corvair does not result in an abnormal potential for loss of control or rollover and it is at least as good as the performance of some contemporary vehicles, both foreign and domestic."
Read the original report
here.
All Ralph Nader proved was that given enough lateral acceleration beyond the moment arm, you can make any car roll.