If I understand correctly, the people harmed by the practice of spoofing are day traders who naively believe they can do technical analysis on an order book to determine the short-term direction of prices. Nope, I don't really feel sorry for either of them.
It disrupts price discovery and allows the market markers to move the market at will. It's not really relevant whether you personally love day traders. There's nothing illegal or immoral about day trading - but there is something illegal about market manipulation, and specifically, spoofing. At least in traditional markets.
