Would it be easier for the president to hop aboard the "let's kill Islamic terrorists" bandwagon? Of course. It would be popular, understandable, and a political rallying cry for a president who could use all the support he can get. That he refuses to take that route in his public comments is, even if you think he is wrong, an example of moral courage.
"Each time a person stands up for an idea, or acts to improve the lot of others, or strikes out against injustice, (s)he sends forth a tiny ripple of hope, and crossing each other from a million different centers of energy and daring, those ripples build a current that can sweep down the mightiest walls of oppression and resistance." - Robert Kennedy