Would it have been better if they sucker-punched him because they didn’t like the color of his shirt, his Rolex watch, or the car he drove? I’m honestly not sure if they were looking for anyone in particular, or just happened to sucker-punch the first poor sod they came upon.
I fail to see the point of additional charges. Punching someone in a bar fight where no one ends up seriously hurt will likely net you a fine and maybe some community service. A year on Rikers Island is quite a step up from that — no need to go overboard.