I am not a libertarian because I favor regulation.
Lack of regulation in work standards brings us unfair labor practice and unsafe working environments. We have seen this film before.
Lack of regulation in environmental standards brings us pollution, endangered species, and loss of common space for fishing, hunting and outdoor recreation. We have seen this film before.
Lack of regulation in the financial sector brings us monopolies, market crashes, and wealth disparity. We have seen this film before.
Lack of regulation with foods and drugs brings us poison and snake oil.
Libertarians are not against regulation. They are against regulation that is detrimental to the common good. They also accept that government intervention is sometimes necessary to prevent monopolies that act against the common good.
I am not a libertarian because I favor social welfare. I believe that reducing poverty, increasing education, providing basic living standards and increasing the well being of all actually benefits our society more. Doing these things is what decreases crime rates, improves technology, helps economy.
In short, I want to better our system and increase the pie. Libertarians want to dismantle our system and grab whatever bits of pie they can.
Libertarians see charity as a virtue. There is nothing that prevents you from taking on as an obligation to help the poor. However they do see an enforce welfare state as a contradiction in terms. You are not being charitable. You are passing that responsibility off to the government hoping they will be responsible for the poor and disadvantaged in your stead. If they fail at that, oh well, it's no longer your responsibility.