Is it safe to own a car with a "Smart Key"?

I wouldn't want one, the point that you can START the car is where I would really be worried. I have a remote starter that doesn't start other cars, and even then without the key in the ignition it shuts off as soon as you hit the brake. Great safety to make sure no one breaks in and tries to go off just based on a starter. I mean the trunk thing doesn't exactly bother me, so you push a on instead of someone being able to pick the lock. My point is that other then accidentally getting in the wrong car if someone wanted in your trunk they probably could get in.