Why do we credit the last thing that a suicidal person listened to, and not the long line of shitty life events that lead them up to that point?
Which is to say, not at all? Nobody takes the mental health of students seriously. If we did, our schools would look quite different.
Maybe there is no causation or relation, maybe there is, what is the issue with finding out?
I'm sure at one point studying many of the attributes of what makes a serial killer were considered with the same contempt.