Fun fact. In the 1960's the MIT Campus Police were elevated to be State Police officers, because back then the students were protesting, and as State Police officers they had the power to order the Cambridge City Police off of MIT grounds.... the goal was to protect the students (so they might get some kind of internal Committee of Displine sanctions for flinging sh*t at people as part of a protect, instead of getting treated as criminals by the Cambridge cops).
One of the things which was mentioned in the report as a potential policy question to be considered is whether random visitors to the campus should be given some level of consideration as extended members of the MIT community. (If Aaron had been an MIT student or some other member of the MIT community, the situation would have probably been handled quite differently, and it might have gotten escalated to someone higher level inside MIT --- i.e., one of MIT's Deans ---- much more quickly, instead of having the Cambridge police get involved, who then brought in a Secret Service buddy of his, at which point things escalated down a very different path, one which was largely out of MIT's control.)
One important thing to remember is that when people talk about "MIT decided", it's really not MIT as the entire organization, but individuals who happen to be MIT employees making various decisions on the spot. So from the perspective of the institution, if someone makes a decision which is within their scope of their responsibility, and that decision was consistent with the policy in force at that particular point in time, and that person was acting in good faith, MIT the organization has to really protect that person, and not offer that person up as a sacrificial lamb to hordes of ravening Internet denizens screaming for revenge. It might have been the case that if someone like Hal Abelson had been brought in that fateful night, he would have made a different choice at multiple points in the timeline. But until Aaron committed suicide, it seems pretty clear that this whole affair wasn't considered something that required the attention of senior MIT administration officials, or the consideration of senior faculty members such as Prof. Abelson.
In some ways, the way some folks have been complaining about MIT is very similar to how the Republicans have been certain that decisions made by lower level staffers in the IRS must be something where direct blame must be laid at the feet of someone senior in the White House.