And this is new. when he was running and in his early days was eloquent and seemed compassionate. His reaction to the first school shooting was impressive, the Gabby Gifford case, less so and the beginning of a turn around.
I believe it is classic ineptitude and inexperience. Obama is a very, very arrogant man. He does not easily accept input and criticism is beneath contempt. I believe he saw the presidency as a his domain, was not prepared to be questioned by opponents and the media.
And, after the disasters of "if you like your plan..", Benghazi, Syria, IRS, VA, Israels 1967 borders and now Ukraine, he's figured out that anything he says will be examined for fact, and so says little.
I also think his ability to fake compassion for others has waned, he simply does not have the interest nor energy to maintain the facade. And, he doesn't care. He never did, really, but it was all about him and now that he has nothing to run for, he simply doesn't want to anymore
"Small people talk about people, average people talk about events, great people talk about ideas" Eleanor Roosevelt