Lets not.
Because if he went to the Nats and said the exact same thing about the Royals... nearly every person that's trashing him now would be riding his sack regardless of what he had to say about his prior team.
Aces are Aces. They don't just show up on your door step.
I guess I'd rather have a malcontent with amazing talent than the dreck we have now.

I guess I'm in the minority on Greinke, as I was happy when there was talk he might be trade here knowing he would never waive his no trade clause for the Nats. I was a huge fan of his when he had his breakout year, and still was so long as he isn't on my team. Before this comment, at least. But as far as him coming to the Nats, prior to this comment, I didn't want it because he is a genuine head case. He has some serious issues, which have had and likely continue to have an impact on his performance. Considering he was or will be hardly the only option for an ace SP we can get in the next couple of years, as much raw talent as he may possess, which is undeniable, the risks involved simply made him incredibly undesirable in my opinion.
Then add these comments? Any player who doesn't give their all is an jerk no fan should ever, ever want on their team. Fine, you don't like losing, no one does. But as an athlete, you play for your team. What it says about a players character that they half-ass it because they're tired of losing, in essence saying they don't care about their teammates and fans, that they consider themselves too good or their teammates/fans aren't worth someone of their level giving 100%? That's an issue totally separate from his depression/psychological issues, and one far more troubling. Hell, he already says he hasn't found anyone that "annoys" him in the Brewers yet. He doesn't seem like a team player at all, and admits to going out there and just winging it...
I'd rather have a AAAA guy who wants to be here and gives 110%, even if he doesn't get the numbers Greinke gets giving 40%. Just on the basis alone, and further what a player like that does to the clubhouse and the effect it has on all the other players numbers. Then you add the psychological issues he's had, and is at risk of having in the future? No, I'm definitely thrilled he's not a Nat, and I'll gladly take any other ace SP even if it means we have to wait a year. A player like Greinke is not someone I want on the team I root for, and in the end, for a struggling, developing, likely losing for the near future team like the Nats, he's likely to have an overall negative net impact over said random AAAA guy. After these comments, I don't understand why any team that isn't a lock to win 90+ would want this bum. And considering his comments about not finding anyone that annoys him yet, combined with the personality it takes to half-ass it and then openly admit to doing so, I don't know why any winning team would want him either. Putting up great numbers is awesome, but clubhouse chemistry and having an albatross in it can seriously mitigate the value of said numbers. And as Knorr already brought up, if you need any evidence for my viewpoints, see Haynesworth, Albert. That's without the depression/social anxiety we already knew before we found out Greinke is a jackass.