It's sad because the Celtics should already be motivated 110%, at the utmost degree, to win the Title. They shouldn't need any more motivation to repeat - they are the best team in the league. Plain and simple.
If Mo Williams said "Man, the Celtics stink and we're gonna crush 'em!" it'd be one thing, but he did not say that. There was no malcontent in his words towards the Finals/Celtics - he thinks his team is going to win the Finals, which means he thinks they'll beat Boston.
People have the tendency to read into things too heavily and with scorn, which is exactly what many of you are doing. That's fine, we're all fans who love our teams, but step back from things for a moment and digest the material before calling for heads to roll.