Some schools have teachers or school resource officers stationed between school and mass transit stops. This is for the protection of both the community and the kids. In the absence of school resource officers or staff, it's going to be MPD. That's a set up for something bad to happen. MPD is not skilled at de-escalation and teens with group think and hormones are prone to terrible decisions.

I'm guessing based on your Reddit profile and questions/comments that you don't live over here or have kids in MS or HS. This is not like demanding to know why schools are not omnipresent. This is 2 blocks from the school on the commuting path to metro at a known hot spot.