He can in this case, because this time it really wasn't his fault at all that they lost, and if they had somehow won, he would have gotten the lion's share of the credit, and rightly so.
As for calling out his teammates, well, you'd be a little frustrated too if you had played like he did and gotten so little support. It's hard to fault his teammates entirely, largely because some of them are not meant to play as much as they did, but because of the injuries, had to, but I think that James was just incredibly frustrated that their season ended the way it did because their 2nd and 3rd best players were hurt. I doubt Jordan would have smiled and given props to his teammates back in 1997 or 1998 had he not had Pippen AND Rodman, and the Jazz had beaten them. Plus, James is probably the most criticized athlete in the world, which is crazy when you consider how good he is, and don't think he doesn't know that.