A box cutter was produced, and the unfortunate kid wound up with 4 lips instead of 2 in about 3 seconds.
Thank god for plastic surgery.
Aside from that, a box cutter wouldn't put a dent in 20 or 30 PO'D passengers.
I'm not trying to diminish what a box cutter can do. I darned near cut of my finger a couple of years ago with an exacto knife. But, its that numbers thing, 30- 220 passengers against a guy or a few guys with box cutters is ridiculous.