Both the government and the individuals who caught malaria can sue the person who created the code-violating pools, especially since that person is aware of the resulting health effects. A lawsuit against someone who inadvertently caught malaria will obviously go nowhere, because courts consider intent.
Since the status quo is that public lands are regulated by the state, the state will sue people who illegally poach endangered species within its jurisdiction. However, if another state allows the poaching of the same endangered species within its jurisdiction, a libertarian approach in the first state would allow for animal parts to be imported from the second state and sold within the first state.
A comprehensive definition from Wikipedia:
> Libertarians seek to maximize autonomy and political freedom, and minimize the state's encroachment on and violations of individual liberties; emphasizing pluralism, cosmopolitanism, cooperation, civil and political rights, bodily autonomy, free association, free trade, freedom of expression, freedom of choice, freedom of movement, individualism and voluntary association. Libertarians are often skeptical of or opposed to authority, state power, warfare, militarism and nationalism, but some libertarians diverge on the scope of their opposition to existing economic and political systems.
https://en.wikipedia.org/wiki/Libertarianism
You seem to be painting all libertarians as a homogeneous extremist bloc, which is just as fallacious as ascribing minority hardline stances to "all liberals" or "all conservatives". The above describes general concepts that libertarians support, and absolutes such as "absolute personal freedom" are ideologies that pragmatists recognize as infeasible.