Another take:
Here's the theory: a two-bit mook is sent by Al Qaeda to do a dastardly deed. He winds up neutering himself. Literally.
Authorities respond appropriately; the President (as this president is want to do) presides over the federal response. His senior aides speak for him, letting reporters know that he's videoconferencing regularly, that he's ordering a review of terrorist watch lists, that he's discoursing with his Secretary of Homeland Security.
But an in-person Obama statement isn't needed; Indeed, a message expressing command, control, outrage and anger might elevate the importance of the deed,would generate panic (because Obama usually DOESN'T talk about the specifics of cases like this, and so him deciding to do so would cue the American people to respond in a way that exacerbates the situation. [...]
Let the authorities do their work. Don't presume; don't panic the country; don't chest-thump, prejudge, interfere, politicize (in an international sense), don't give Al Qaeda (or whomever) a symbolic victory; resist the urge to open the old playbook and run a familiar play.
Obama and his team obviously prefer a far more mature, strategic approach. It's about projecting a sense of calm and control. It's about choosing not to elevate some lunatic thug who set himself on fire [....] It's about competent and effective leadership, and it's what the country was sorely lacking up until 11 months ago.