There are unlimited professional reasons to exclude Donovan. What if he earned a beep test score equivalent to a middle schooler (as is rumored)? What if he indicated that he felt he should start no questions asked and pouts when not playing? What if his presence led to a deference of younger players? We're talking about a guy that said he was no longer capable of training hard for a week straight and bailed on his teammates during their most important qualifying stretch because he was tired.
Klinsmann has to convince 22 others that they can beat Ghana, Germany, or Portugal, and we're not doing it on technical skill. If we advance, it'll be because of effort and team chemistry and "getting each others' backs." Donovan doesn't strike me as someone I'd want to battle with.
Speculitis. The irony of winged lecturing others on quitting over petty chemistry issues is so rich to me.
Go ahead and watch these team guys finish with a -10 GD. US progress!