If a player calls a KOS on something that is not KOSable (ex. "Dick Buttermuffin smells like a Traitor, KOS him!") can it still be taken as a legit KOS? And if someone follows the KOS, who is responsible for the RDM? The KOSer or the person who followed the KOS?
Anyone can choose not to follow the KOS and tell the KOSer that the reason is invalid, but it still counts as a KOS.