I just happened to end up talking about this with people on IRC. I think people on Smackdown are getting tired of being treated like the B-show. Look at when SD guys invade RAW, they might beat up some jobbers or mid carders, but the top guys usually get away scot free. When RAW guys invade SD, it's usually mid card RAW guys destroying most of the SD roster like we saw yesterday.
It's got to be demoralizing to the SD roster, when the company so blatantly favors one brand over the other. Tazz and Cole better watch out, cause anyone who speaks truth in WWE ends up getting humilated, de-pushed, or fired. Sometimes all three.