My point isn't contained to the present system:

Even in theory, libertarians are hypocrites because they fundamentally advocate for failing to pay for the externalities of their coercive system, and all supposed benefits of libertarianism can be traced to temporary boosts caused by (inefficient) capitalization of that failure to pay for externalities. Libertarianism enriches a few by creating 0.9 units wealth for every 1.0 units of collective suffering it implements over the current system, but hides this fundamentally externality driven mechanism behind the spread of the suffering (not a lot to everyone) and calling it freedom for many to be allowed to suffer at the hands of others without the instrument of state to implement collective relief.

Libertarianism is nothing but a sham political and economic movement that is wholly and fundamentally dishonest about its benefits and costs, by design, deeply self-inconsistent in its models and policies, and is intended to trick people in to accepting serfdom in a return to feudalism by calling it "freedom".

Libertarians, as a rule, just seem to have not thought very hard about their position or be selling you something (usually that you should be a serf because they fancy that they won't be a serf too in the new system).

Is there any economical system you disagree with but don't consider dishonest?

Sure, lots of them. Now, many of them are still hypocrites, in that very often a model will claim to address something as a top priority, but not actually address it. (Ed: not a hypocrite to propose a model that doesn't work out; hypocrite to continue to claim it will work when errors are discovered or it can't help, even in theory.) Which is why I called Libertarians so -- they bark about externalities when their model is fundamentally about not being accountable for externalities of coercing others to obey your model.

However, the dishonesty of American Libertarians stems from something further than that. Namely, American Libertarians are neo-feudalists in practice, but won't own up to being neo-feudalists.

I find this to be dishonest: they, so far as I can tell, have done this purely because they want to advocate neo-feudalism and its benefits without having to justify the benefits in terms of the costs, so they use terminology where it's harder to find the costs in academic literature and deny that any such costs exist. Nothing different than creationism rebranding as "intelligent design" or anti-abortion as "pro-life".