Clubs have always been inspired by successful clubs of the time. Wasn't our red and black away kit originally inspired by Milan? There are at least 2 Everton's in South America. Is there genuinely any risk of someone confusing the two? If not, who gives a shit that a presumably semi-professional team is using a badge that's similar to ours?
As for all this "if you allow one, then you'll lose the right to enforce your copyright," the club are completely free to pick and choose when to enforce copyright (assuming they have a case - a cease and desist letter just means that some brand manager and lawyer think it's a copy, not that it actually is) and the fact that they allowed it in one case isn't a defence for anyone else who copies the badge.