No. This libertarian idea that people would give more if they weren't taxed is utter bullshit. As is the idea that every human is an island. We're all in this together.

The charities people give to? For the most part, it's acute and visible charities. Very few people give to the same charity again and again, over the course of decades. People also give to attractive charities - kids with terminal diseases is a much easier charity to raise money for than mental health in young adults. Same with animals - people care about cruelty to dogs, but they don't care about cruelty to voles. And while you haven't said it, another libertarian refrain is that people would donate more than they get taxed, which is obvious nonsense, because nothing is stopping them from disposing of that extra money.

Anyway, if you don't want "violent" (stupid bloody redefining, that) taxes, then move to Vanuatu. It has good weather, happy people, a small government, and the army is so small it's also the police force (fewer than a thousand people). There's no income tax. Of course, there's little comparable in the way of infrastructure or services, but you'll get to live the libertarian dream of hiring your own garbage collector instead of having one violently forced on you by the incompetant apparatus of the overbearing state.