Some crime happens on a college campus probably every day. Most likely hundreds of violent crimes a year. But the reason this is on HN is MIT, nothing more.
We recently built an app that tracks this based on official US government data - per the Cleary act every US college that receives Federal funds must declare their on-campus crime rate. https://itunes.apple.com/us/app/campus-sentinel/id513108130?... - you can compare MIT to other campuses.
There is a serious problem with HN when stories like this get so many up-votes. This story is against the site guidelines. There isn't anything deeply interesting in the comments.