>>Unfortunately libertarianism today is more of a "live and let die"-type ideology, where those who cannot support themselves must fail, as they provide "no value". It is social darwinism writ large.
Altruism is completely orthogonal to libertarianism. The only consistent property of libertarian policies is that they protect and preserve the right to voluntary interaction.
How people choose to voluntarily associate is in no way a concern of what's defined as libertarianism.
In other words, one can believe and promote a society based on compassion, sharing and collectivism, or a society based on self-sufficiency and only profit-motivated interaction, and be equally libertarian.
>>the effects of gutting for instance the EPA has massive consequences, irreparable damage to the environment and to people's health. Or do you think the people in Flint, Michigan should just move somewhere else?
There are a multitude of types of regulations, and not all of them violate the non-aggression moral principle that libertarianism holds as inviolable. Environmental regulations generally do not violate the right to free association, and can indeed protect rights, so are generally consistent with libertarianism.
Moreover, regulations have a multitude of effects, and not all of them positive. To quantify their net effect on human welfare requires far more evidence than the single data point you've provided. It requires a comprehensive and methodological accounting of their entire impact.
>>Voluntarism doesn't work, for that exact reason. Hence why regulations and laws are needed.
Voluntarism does not imply a lack of laws. Voluntaryism can only be enforced with laws and a state to back it. There is a distinction between laws that protect people's right to their life, liberty and property, and laws that violate it.