If you don't understand that the child of a lawyer will be encouraged or pressured into going into law, and therefore staying in the socioeconomic group, you'll overrate genetic factors.
The genetic factors estimates come only from adoption data, and there are studies that condition further on things like adoptive parent material conditions. The researchers are not dumb; they have put some thought into it.
One of the first results on google scholar that came up when I checked into your claims is a recent study that contradicts everything you wrote here. (Since you never cited anything I won't either.)
At a minimum, this topic is more complicated than you think, and you aren't using the correct statistical terminology when you discuss it.