"Without any legitimate basis, of course."
That's just as asinine a statement as those who put vaccines in the cross-hairs. The correct answer is simply that we don't know.
Here's my opinion: It's silly and presumptuous to assume a one-size-fits-all proscription for a public health problem. Humans, though similar basically, also have many differences in physiology and body chemistry. What may be helpful, or at least harmless, in one individual may be toxic in another.
Bottom line, stop being so simplistic.
Your logic is fatally flawed. If the answer is unknowable, as you have asserted, then I have to be accurate when I say there is no logical basis for a belief in a position on the issue. So instead of calling names, hold the thought and get a mirror - at least until you are capable of thinking through an issue.
I would also add that with each progressive generation, any dormant genes relevant to mental illness will likely surface and be more apparent in the offspring.
I have a friend whose father often had bouts with depression and he himself suffered likewise. As for the father, well, the explanation was people got depressed and nothing was ever done about it.
As for my friend his depression would often include thoughts of suicide but with counseling and occasional medication, he was ok.
Then he had two children, a son and a daughter. Both the children were diagnosed as being bipolar and on much needed medication. The son ultimately committed suicide at the age of about 31. The daughter, who is still alive, has extreme mental problems that can only be controlled with medication. Since she is married to an individual who is also bipolar, they can not have children due extreme likelihood that their children will inherit the bad genes but only worse.
Lots of our ancestors were given a pass as being a little strange or crazy when in reality they really did suffer from some form of inherited mental illness........