But in the news articles I parsed, one thing that was glaringly lacking was actual evidence, or any type of reliable information from the ground.
It's just possible that the President with the entire intelligence assets of the United States at his command might have better information available than people writing news articles.
Theoretically, he might have access to it, but he has shown to distrust intelligence community. As such, it is safe to assume he have seen something on late-night TV and decided to bomb based on that.
This was done for one of the two reason - political move to signal coming home to establishment or foolish reaction to media hysteria.