Originally you said I am obligated due to my education (which you also reiterate here), however you've now shifted the goal post: I am obligated to society because I gained education AND because I choose to participate in it.
I say my education is moot, and I am allowed to participate in society with zero obligation.
> As a member of a social species of animal, why do you believe this to be true?
Because it isn't false. Where is my obligation exactly? What "obligation" does any animal have? I am most certainly an animal, but I'm an intelligent one and I choose my obligations rather than letting others choose for me.
Edit to address your other points:
> if you’re participating in discussions on HN using a computing device, you have obligations.
No, I don't. I can do whatever I wish.
> The value of those books is not primarily monetary. Those books have utility because they are transmitting the collective knowledge of our species; ancestors whose thoughts and discoveries are the basis of our lives today.
Who cares? I'm obligated because they recorded their knowledge and I studied it? No, I am not obligated, I am educated.
> Many people never stop to consider or admit their dependence on this ancestral knowledge, or their own responsibilities as a beneficiary of it. Almost everything we come in contact with (unless you disconnect and go to that cave), comes with implied collective responsibilities.
Again, no it doesn't. This is lazy collectivist thinking.
> Paying taxes is the minimum legally required level of contribution
Taxation is actually theft and shouldn't be allowed. This isn't a contribution at all, it is theft by the government.
> but far from the only required activity to maintain a functioning society.
OK - sure. I never said it wasn't. I also don't care - it's not my problem, not my focus, not my "obligation".
> You might say that you don’t like this society
No, I just don't like humans.
> or would prefer a different one
No, I just don't like humans.
> but the only solution to these problems is to involve yourself in the process
Involving oneself in the process doesn't imply "obligation"
> which is the only path to changing the status quo.
No, not really. One can make a big splash being outside of "the process".