Having excellent security IS keeping things in perspective. Overkill for you maybe, but not enough for them to pillage your home.
Your lapse is their gain.
Perhaps you have more to lose than I do? Location undoubtedly plays it's part too.
We have been subject to past burglary of our home several years ago, in fact whilst I was pregnant. Everybody deals with these things differently, I took it in my stride and did not stress out over it, even though I was perhaps in a (arguably) more vulnerable condition than usual.
We have taken reasonable (in our view) precautions, burglar alarms, security locks, window locks etc, but if this is not sufficient then so be it. We simply do not want to turn our house into a oversized steel safety deposit box! We will not let the ill intentions of thieving scumbags inhibit our freedom to significant effect.
And with respect to theft of the car/keys, as Fredgroves says, at some point you will need to leave your home. Wasn't it you that said, a few days ago, it was not good to cocoon oneself away.