I'm saddened to read about the apparent murder of a Yale Medical student. It reminds me that when I was at Yale, I found the university to be incredibly cavalier about security. I spent 5 semesters living in the law school dorm, and therefore walking around the immediate campus area. In that entire time, I saw exactly one police car patrolling one time. By contrast, when I attended Brandeis as an undergraduate and lived on campus, I saw campus police patrolling our much safer campus all the time.
After a law student's face was slashed right in front of the law school my first year there, Yale hired a security guard to sit inside the law school building at night. Most of the time he was asleep. This was literally the only security I ever saw in the entire law school campus.
I've visited the campus several times since then, and security seems vastly improved (from a very low threshold) following several tragic incidents involving Yale students. But given my experiences there, I wouldn't be surprised if security nevertheless remains inadequate.