And more equally distributed ones: there are not many easy solutions anymore that are pareto improvements, ie do not have downsides elsewhere.

For example, the door to the cockpit is locked now to keep terrorists out - which allows a suicidal co-pilot to fly the machine into a mountain undisturbed. (Having said that, a suicidal pilot can take down the machine one way or the other, so maybe locking the doors was a pareto improvement.)