Not protecting them from anything in particular, or maybe I guess you could say from themselves. Kids commonly have issues with impulse control and general irresponsibility. By 14 they seemed old enough to not immediately lose or break their phones. Not in bed is to try to lay a foundation of good sleep habits. Having the common computer room keeps the sense of 'being in public', which helps the impulse control part as your motivations work differently when you're alone.
