I agree . I too think that we place to much emphasis on biology (of course, choice on the part of the parent may still enter as an issue - for example, suppose a woman agrees to carry the child because a man is willing to raise on support the child, only for the man to later decide that he does not want to... However, intent is a pretty sketchy thing to determine in the court of law so perhaps we need a flat assumption in favour of distributed welfare).Good question. Welfare is preferable because it distributes the burden equally (I know, not something I would usually say).
I don't agree with singling out the biological parent to pay, because I believe their responsibility for the child is an arbitrary construct. I see nothing wrong with abortion, and given that, I believe having a child is 100% a lifestyle choice. If one parent wants to have a child and the other doesn't, the parent that wants the child should have absolutely no right to make the other parent pay for it.
In part this depends on what one holds the goals of political philosophy to be. If it simply acts as an ideal - a guiding light perhaps - then it doesn't matter so much whether we ever get there. However, what I was noticing was a potential statement of impossibility given that you endorse the peaceful transition to AC society (which I thoroughly endorse if it is ever to be tried) whilst acknowledging that extreme anarchocapitalism or libertarianism will never be popular (apologies if I read too much into this statement) which would thereby prevent a peaceful, popular transition to AC living.Not really? World peace, or an end to hunger may be unattainable, but we don't stop striving for it.
In the meantime it is important to set realistic goals like cutting taxes and legalizing marijuana, but ultimately I'm not going to change my view of what is right just because others don't agree.
I also think the watered down version of libertarianism is less convincing to people anyway. It's more powerful to just come right out and say that you want to get rid of the whole damned government. In fact, the reason I became AC was because I was initially shocked and disgusted by the idea, which provoked me to research it further.
Certainly this doesn't prevent you from holding high the AC ideal, in particular if you use it as a rhetorical device as you have pointed out. However, I do think that 'impossibility' (in the interest of being truthful I would prefer 'strong improbability' myself) weakens any argument you might make which posits the dynamics of AC society as a solution to a current issue - be it violence, taxation, welfare, education, healthcare, etc. Once we start talking about solutions it is important that we keep one foot in the practical sphere of the possible/probable, even if we retain our guiding light at the same time. In this sense I think a watered down form of libertarianism becomes important if you want to make realistic policy recommendations - such as you made for child support (shifting the burden from the individual to society).