So i think that the reasons that all the bad things happening is because of the cry child Reason we know ghosts exist and that the crying child died thanks to a glitch in fazbear entertainment animatronic so getting his revenge he is going from employee to employee killing and giving it a bad reputation and making it look like its they are doing it so that they can get revenge on fazbear entertainment and the night guard mike or the older brother and you may say that no its glitchtrap but who is glitchtrap i think he might be the crying child