[roganartu]

> it would be the same as having a second key

This is a bad analogy (unless you mean to say that this second key would be identical for every door, in which case.. sort of).

A better analogy would be that everyone was forced to install a second entry method to their house that only the government knew how to operate.

The inherent problem with this is that as soon as someone else figures out how to operate it, everything with this entry method installed would be accessible to them until it changes or is fixed.