Even the guys on KillieTV, who have been very fair-minded, are saying it was a stick-on red card - and it was. Lewis has the ball under control and then gets Broadfoot's studs to the face. It was an oafish, dangerous challenge, and even Broadfoot didn't really protest when the card came out.
Aberdeen have probably shaded the game without creating anything of note. Cosgrove is probably one foul or incident away from a red card now - Broadfoot going off is probably a help in that regard. Devlin not looking too clever against Brophy at times, and he is also probably a foul or two away from getting his marching orders.