I’ll have to say that the incident(s) have caused us to (perhaps) falsely judge St. Olaf and it’s environment. To the extent that my mixed race HS son crossed it off “the list”, even though it is local, and a logical safety for him.
Prior to this year I had never heard of St. Olaf as being a place where race was a problem. Maybe it still isn’t? The OP says that the handwriting was similar on all of the messages.