Taxless society? Are you kidding? Let's forget bitcoin for a while and discuss.
Taxless society means no income from society which means no money is made from them. Now I want to remind you greatest scientist Nikola Tesla. Do you know that he was able to provide wireless electricity but this invention didn't find success because of commercial interests? Imagine how great it would be, how cost effective to receive electricity wireleslly without cables but no, it's not profitable for profit looking monsters who will never be able to spend that money during life but still can' get satisfied.
What about if we humans were pieceful creatures? We spend a lot, really a lot of money in military and for what? Why? Because we can't stand in piece and everytime we have to be ready for war.