An obscure IP comes into existence and it gains popularity after a while. A sequel is needed, so the IP must be expanded upon. When this happens, there are still many blanks to be filled in. Since the official creators can only create so much, fan speculation occurs. After any initial mess, the most logical explanations eventually become accepted as fact.

When the IP owner then goes and does something that's different, the fan base doesn't like that their vision isn't true, so what do they do?