What do you mean by take rightful responsibility for?
Society should be designed with the happiness of it's citizens in mind.
Do you believe that the government should require that embryos be genetically manipulated against the wishes of their parents?
No. I think that would not work - most humans would rebel. However, mandatory genetic screening for all potential embryos should be implemented as soon as possible (the technology needs improvement) IMO. We'll likely start by eliminating congenital defects;
http://www.ibis-birthdefects.org/start/birthd.htm
IMO, it's resonable to demand that people give up the freedom to procreate without genetic screening - just like it's unlawful to knowingly transmit AIDS to an unsuspecting partner. However, the technology needs to be subsidized and freely available/accessible to all.
Do you think the government should require somatic gene therapy for currently existing humans?
Not in general, I think that humans would not accept such a dictatorship - though there are exceptions;
For example : let's say there was a proven method for eliminating the motivation for sex offenders to molest children - this might have to be mandated.
In the future, we may view genetic therapy as ongoing and look forward to 'updates' intelligently/compassionately designed to make us happier.
Would a system of subsidies suffice in your view?
Not in the present.
What manipulations would you consider justified?
In general (and at this point in time) only optional manipulations, though there would be exceptions - just as we mandate treatments today.
Who would get to decide?
Depends on the specifics. In general, we need teams of experts who are under the constant eye of the public and peers.
It strikes me that there is a contradiction somewhere in your willingness to assign responsibility to society but not to the individual. Are they not both "determined" in their actions according to your use of the term?
It will take time to shift blame away from concepts (free-will) and onto our [policies/systems] in a positive way - we'll have to build an infrastructure that supports the Abolitionist directive.
Also, are you ruling out aversive stimuli as a part of the "learning experience of the individual?"
No, aversive experience is still required with our present design (though not to the extent utilized today.) There may conceivably be cases in the future where an individual might choose to retain the option of suffering - however, when suffering is truly optional - I think it's unlikely that anyone would choose pain over pleasure.
just a quick response, more soon. thanks for the great questions!