I agree with all you said thundyr but suarez was lucky to stay on the pitch when he gave Dawson a boot whilst he was down, but Webb just hates Liverpool, even Kenny admits it in his own suttle way in his post match interview.
I think Webb realized he screwed up with the Dawson dive, which is why he gave yellow; the incident wouldn't have happened if he hadn't fallen for/chosen to reward the dive, so the error was partly his own. Suarez toe-poked rather than kicked with intent, and it didn't hurt given how Dawson leaped to his feet in reaction, so there was nothing in it. Had he rolled around trying to milk it as others often do... If Webb had given a red inside a few minutes of the start of the game for a love tap after he'd made an obviously wrong call, his reputation would have been marred, and the fans would have given him hell all game. Yellow was the right card, and he knew it.