In theory, one who believes in limited Government only to protect our liberties. Libertarians should be allowed to do as they please, so long as it doesn't conflict with the liberties of others.
In practice, modern libertarians feel they should be able to do whatever they want. Liberties of any who disagree are often hypocritically cast aside with fallacious excuses to rationalize the libertarian's actions. This especially applies to the realm of capitalism. In an economy with finite resources, limited government ensures capitalists can act with impunity & the rights of individuals, doing as they please, & perpetuating few wealthy & many poor. The adoption of libertarianism is often not due to a refined comprehension of the constitution, but rather, parental indoctrination.
Many opinion-based beliefs of such libertarians include: all rich earned it w/ hard work & will, all poor have only themselves to blame, no one's entitled to anything (not even healthcare), & success & failure are b&w. To them, sociological advantages & disadvantages are nonexistent; all people have to work equally hard to attain & retain wealth. Being born mostly into high-income families, they're accustomed to security & resources. They have little concept of hardship. Psychologically, they ascribe notions of hardship to experiences most people of lower socioeconomic strata know to be frivolous (feeling entitled to great gain, wealth they're accustomed to, but with objectively disproportionate effort).
Person: "Did you hear about Brenda? She had to get chemo. She grew up very poor, so she has student loan debt from getting her Master's deree. She works hard and makes good money, 50k a year, but they're not paid off. And she pays for her own insurance. They said they'd only cover 75% of her chemo. So she'll be in major debt. Wish we had universal health."
Libertarian of 2011: "Why? So we could all be sick and dying like in Canada, Uk and France? No thanks! It's all her own fault. Not the cancer, but her finances. She'd be ok if she weren't a lazy bum. She'd have better insurance if she shopped around like me. I pay $50/month into some magic, shitty HSA through same company as her and I think they'll cover 100% of anything. Makes no sense, but I swear it's true. And she should have gotten a better job like me. My dad didn't just give me the job because he's the CEO. I had to work my butt off through 4 grueling years of college. She should also start a side business, invest in stocks and bonds, and a bunch of other stuff I can only easily do because I was always wealthy."