I really hate whenever I try to explain how some bad rules can be abused and immediatelly get someone say shit like "If this happens in your group, change it" as if that would solve the problem. And whenever it is not soemthing you witnessed personally, then it means it never happens and could never happen.
Obviously it is a fault of individual toxic players or the DM. You cannot seriously expect us to fault the system itself for individual cases of bad behavior.