Yes, I'm aware of the feedback theory.

Then as an aside (and I will address the rest of your post momentarily), why did you assert:

On the occasion most intellectuals are willing to admit this correlation exists at all, they immediately insist that it is completely due to (3) and proceed to ingeniously seek ever subtler forms of racism.

Secondarily, there are plenty of proposed interventions in the (2) part of the feedback, both from blacks and whites. Bill Cosby is rather famous for them; Chris Rock also has a particularly poignant set of criticisms. Part of the problem is that plenty of people have polluted the "criticize (2)" pathway by using it as a justification for reinforcing process (3) - "concern trolling" is a well-worn path.

As for the other groups, each of those groups came into their situations differently; I might suggest comparing black culture to native American culture, rather than Jewish, Irish or Asian culture. Sociology and history are complex, and outcomes are highly path-dependent.

On a seperate channel:

Yes, I'm aware of the feedback theory.

I didn't ask if you were aware of it, I asked if you had considered it.

I will point out that you still have the problem of how other groups, e.g., Jews, Irish, Asians, were able to break out of the feedback loop.

I am going to make a criticism about tone, here, but please understand that I'm not doing this as an attempt to refute or dismiss your argument; I'm doing this out of a legitimate desire to help you get your message across to people who would otherwise be unreceptive to it. You have a tendency to force your idea of other people's position down their throats; it often comes across as wanting to 'win points' against liberal positions, rather than an attempt to actually seek truth. If you avoided personalizing language when criticizing liberal positions, you might help people see an opportunity to distance themselves from those positions, and thus help people avoid mind-killing emotional responses to having their positions challenged.