Comment by kmeisthax

Any physical lock can be manipulated, even the particularly high-security ones. But in practice, most locks are not even challenged because doing so requires actually walking up to the lock and trying. You can't try every physical lock in existence; but you can try every digital lock. So the effects of, say, an encryption backdoor key compromise would be far greater and far more immediate than, say, the compromise of the Travel Sentry master keys.