The President could have simply stated, as you note, that those rioting were/are criminals and thugs and called for it to stop immediately. That would have been the right thing to say. But no, he had to expand on that - for 14 minutes - throwing up all kinds of excuses and rationale for the riots, in effect, justifying them as an understandable response. That was wrong, in my view.
And you know, when the President comes out, as he frequently does, and criticizes the police for their interaction with people of colour, does he ever speak to the excuses or rationale of why the police may act the way they act? No - he doesn't. He also uses those occasions to excuse and rationalize the behaviour of the people of colour who either lose their lives interacting with police or others, such as in the Zimmerman case.
So maybe you should ask yourself why you can't understand what the President says when he speaks. I get his position plain and clear.