Words have consequences, especially when uttered by the President of the United States. People may take action based on his words.
Getting tired of all the excuses for his deplorable behavior.
More to the point, the real question isn't even what he said but why he said it. Why does Trump constantly defend Putin even to the point of making such a ridiculous assertion? He's always defended Putin, without exception. "Diarrhea of the mouth" does not explain this because there's a pattern to it. Trying to explain his consistent defense of a hostile dictator as something akin to Tourette's syndrome does a disservice to a nation who has a right to know where his ideas about foreign policy are coming from.