You don't stick a knife in a man's back nine inches and then pull it out six inches and say you're making progress.
Half a loaf is better than no bread. If we cannot secure all our rights, let us secure what we can.
Wherein is the use of getting rid of one thorn out of many?
The oldest habit in the world for resisting change is to complain that unless the remedy to the disease should be universally applied it should not be applied at all. But you must start somewhere.
We may not be able to get certainty, but we can get probability, and half a loaf is better than no bread.
You can do a lot of damage if you try to answer a question part-way.