I'll also add, your "debate style" is very counter-productive. Even if you loath a belief, the worst thing you can do to change that person's mind is insult them and call their views "la-la land".
Because world has not seen a libertarian government yet.
> Taxes = theft
There are two arguments here. 1. Tax Amount. 2. Consent.
Most of the arugment against taxes from libertarins pov is the amount. Govts does provide a useful service but the pricing is too costly.
A libertarian may immigrate to a favourable country which gives best bang for the buck (for which somalia fails) and in process giving new govt the required consent to make taxation consistent with libertarianism.
> They don't get that monopoly on use of violence as ultimate arbitration is what allows society to exist in the first place.
You are thinking of anarcho-capitalism (a special case of libertarianism nonetheless) which I presume we are not talking about. Then libertarian govt still hold the monopoly on violence and only justifiable in very limited cases.
Government = bad, Taxes = theft, is what all their arguments boil down to and you end up going around in a circle.
They don't get that monopoly on use of violence as ultimate arbitration is what allows society to exist in the first place.
"Non aggression principle" LMAO. Look at Somalia and other failed African states. If libertarians weren't socially and economically illiterate, they'd all be flocking to those places, because it's as close to their mystical paradise la-la land as you can possibly get.