Why government purposely design windmills to be used in Wind Power projects to be expensive & inefficient?

Science is political and Science is commercial, very little of "science" is honorable these days. Water wheels use nearly all the water in their blade area to push, they don't let 90% through unused, they are efficient. Good Windmills do that too, but these idiotic contraptions used by Spain and the US are built to be complicated and require heavy engineering just to keep from failing, and they need to be scanned for cracks every so many hours of operation because they are so long then the stresses cause them to need changing after so long.