What do I think about what? Grizzling? Not only are we "allowed" there's no-one with the power to stop us. It's my Parky and I'll cry if I want to (I can't believe that's original).
Or about slow progression of the research? Yes, I do marvel at the fact that for a disease whose basic mechanism has been known for decades, we aren't further down the line. That's the brain for you, I think.