When you say RxP is bad because of the details of the proposal then you are going from a general to a specific. I am thinking what you mean is that the APA proposal for RxP is a bad idea because of many reasons you have elaborated previously. The second point seems to be that you believe RxP in any form is a bad idea. Why do you think incorporating medicine into psychology is a bad idea? I actually think that we should learn more biology and biochemistry, but biology (more than biochemistry) has always been an interest of mine and that was my first major so I might be biased that way.