I take it as axiomatic that if I use a medium to coordinate a murder, it's a misuse of that medium.
OTOH, I do not take it as axiomatic that if I use a medium to coordinate commission of a crime, it's a misuse of that medium. There are plenty of crimes that are not only perfectly fine to commit, it may even be immoral to not commit them.
If people commit murder using tools they have available, once you have enough users, it is inevitable people will use your service or medium to commit murder. It’s true to Facebook, it’s true for taxis, it’s true for screwdrivers, it’s true for hotels, it’s true for pretty much anything.
Unless something has clearly been designed to cause problems this way, it’s just blaming the tool instead of the user.
Get a group of 20 random people together and tell me there isn't a dickhead in there somewhere that will intentionally misuse things for whatever perceived advantage they can get.