Not sure if anyone has said this yet, but don't you know that bmx did not start as a trick sport? They were for racing on dirt tracks. So it seems that doing tricks on track bikes/fixed gears is quite similar to doing tricks on bmx bikes.(However, one is better suited for it) It's also like how skateboards and decks of cards weren't originally meant for doing tricks. If poker players don't like doing card tricks, they don't make a fuss about people who do. Get over it!