Not to assert the claim that "this is what I used to think before I knew more" (I have no intent to belittle your awesome brain and mind)... but this was basically my view until I got to upper year biology and biochemistry and realized how much of it was sketchy neuroscience. IME, psychology overreaches genetic and biological conclusions to analyze behavior. If they only took it into account, it wouldn't be a big deal.
But like Babylon says, don't underestimate psychology's inferiority complex mixed with their desire to compete for science funding. Babylon and I have both taken a bit of science to colour our understanding of psychological neuroscience, and it seems we agree that psychology stretches the data far too thin and makes claims where it should be philosophizing. It's disconcerting to see "truth" claimed so boldly when it isn't backed up as much as it is presented, which is why I ducked out.
I don't mean to say there's not value in studying psychology. I do think there is. I technically earned a degree in psychology. It just wasn't what I thought it would be (I thought it would be mapping the terrain between science and philosophy).