I have always wanted to touch a basketball rim but unfortunately I am very short. I used to be able to jump very high, but not high enough. That's what is called an unattainable goal. No matter how badly I wanted it, physics and biology have already decided it's not going to happen.
Politicians like to think their decree is enough to get something done. A stated goal like universal health insurance, peace on earth, or an end to poverty as we know it sounds nice. It may not be possible and we ought to consider that possibility before setting an unattainable goal.