If after examination, you find that a relationship continues to hold up, and if you can’t find any contrary evidence and if you can’t find any alternative explanation, it becomes reasonable to assume a causative link. Until then, doing so, makes no sense at all – common or otherwise.
In the case of males, corporal punishment, and suicide, as soon as we compare men who received corporal punishment and men who did not, and find a slightly lower rate of suicide in the former than the latter, we have both contrary evidence, and that the relationship does not hold up under examination. We’ve already lost two of the three pre-conditions necessary to assume a causative link.
It’s not commonsense to assume the link you are talking about. It’s idiocy.
Why do you think believing CP causes psychological problems in girls was “commonsense”?
Well, in actual fact, I don’t.