I believe the fans of the Chicago Fire specifically asked for and voted on a 3rd jersey that incorporates the city flag thus choosing to make that part of their own identity. It wasn't forced on them by the club. You don't like the NYC flag and that's fine, but it has no bearing on what the Chicago Fire or LA Galaxy do with their 3rd kits. From everything I've read and seen, those 3rd kits are very popular and sell very well. Also, I seem to recall a lot of people here on the forums asking for more orange on the NYCFC home kit which would come from the NYC flag and which would make it more NYC and less Manchester. At this point no one is clamoring for a kit that replicates the NYC flag, but I could see it being popular among supporters as a 'fuck you' to MCFC.