In the Boston Globe, Aaron's lawyer says that a suggested plea deal with probation and no actual jail sentence was rejected by MIT, and that played a part in the prosecutor pushing for harsher judgement. If there is any truth in that, then there is evidence that MIT did indeed play enough of a role to have some of the responsibility here.
We won't have a full picture of what their role might have been until Abelson's report comes out. Which likely will take a good deal of time.