Oh boy, here we go...
You always hear of nurture and nature mentioned as discrete separate factors and rarely ever hear any research about how they may modify each other's effects.
Bullshit. Only when you talk to a fundie. The "Nature v. Nurture" debate ended ages ago.
All legitimate Psychologists and Neuropsychologists will tell you what you just said, that it's an interplay between the two and rarely (if ever) just one factor. This is the whole basis of the simplified diathesis-stress model and the term "biopsychosocial factors."
The use of short simple questionnaires suggests an inappropriate "one size fits all" approach that is unlikely to work given the sheer complexity of the brain. One person's "depression" is not necessarily the same "Depression" as another person.
Sounds like you've been reading some very poor sampling surveys. Or you're looking at Fundie websites too much - surveys that lack validity and reliability are something that psychologists strive to limit. Obviously no survey is going to
ever be one size fits all and that's why you don't stop with one survey. No psychologist, anywhere, is just going to say "oh take this survey...ah, you scored x out of y, you have depression." They'll say "you have symptoms of depression but we're gonna run some more tests" and parse it down. Psychological interviews are also quite helpful, it's never, ever, just one test and done. Inventories don't work like that.
In some cases drugs may not even be the answer.
Which is why drugs aren't always prescribed... you've really been seeing some bad therapists if you gotta say that. Anxiety disorders for example, suffer heavily from the use of drugs - talk therapy really shines there. Whereas in depression, some cases get better just by talking, others require a mixture of drugs and talk. More serious disorders however, medication is still the first line of defense (offense?)
the way psychiatrists will diagnosis and dispense medication with just a questionnaire rather than taking more time to get to know and understand their patient's mind
No, just no. Stop. Right there.
Citation needed. It's true that some ambulance chasing psychiatrists will push pills unethically, but rarely do they ever fail to get to know their patients. You've been drinking the right-wing bullshit diahrrea again.
No generation gets everything right
Nobody's saying we're entirely right, just that, in general, we're taking the next step towards the limit of "rightness." Even if we're never entirely right, each generation adds to the knowledge pool. This is how ALL sciences work and why they're revised. the fact that we do this is the issue fundies have with all of science. Of course knowing your past posts, I'm pretty sure you understand this perfectly.
But you rarely ever see a theory being proposed that says something along the lines of a gene working totally different in different environments
It's called Gene-Environment Interaction and
YES you do. It's a fundamental of Abnormal Psychology at the lowest level. It's
very well researched and thoroughly validated, especially in cases like Schizophrenia. Look at some of the twin studies. I'm seriously baffled here, this is basic Abnormal stuff, the kind of stuff they tell you in the introductory chapter of the textbook. Lecture 1. Never mind when you get to professional practice.
What if there's a gene that leads to a strong interest in philosophical introspection
They already thought of stuff like that with Williams Syndrome kids who were missing 19 genes instead of 20 - thought they could "zero in" on what 1 gene does. Problem is, 1 gene doesn't just do 1 thing. It does many things. Likewise, something isn't caused by just one gene - there's not a gay gene, or a depression gene, or a Williams gene. There's a series of genes whose culminative effect is the disorder. This is true even with the mutation that causes Downs - it's been narrowed down to one chromosome but at the genetic level there's likely multiple gene interactions resulting in that mutation.
awful lot of jumping to conclusions about things
No, sorry, there isn't.
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Conclusion: You seriously have no idea what you're talking about here. At all. Everything you said can be debunked if you took just an Abnormal Psychology course for one single quarter. It's utter right-wing Fundie-level drivel. I can't be more tactful than that, I apologize.
Source: Me, and 5.5 years of Psychology textbooks and training.