This is true about many ideals. See socialist, laissez-faire capitalist, and communist supporters for arguing points. Hell, see any utopian idealistic system.

This is true about many ideals. See socialist, laissez-faire capitalist, and communist supporters for arguing points. Hell, see any utopian idealistic system. The excuse is the implementation always fails. How many times does implementation have to fail before we start to question whether it is simply possible to implement it correctly and whether it's worth the cost and frustration in the first place?