I wonder why they joined if they're not interested.
Common questions or concerns about libertarianism.

Not sure, maybe those who joined are more introverted than extroverted, and were hoping to learn from observing as opposed to discussing?

I don't know, but I've seen a lot groups start out enthusiastically, then become dormant. More group invites should be sent out.

Thought I would re-issue my offer here...
As noted before, I have come to believe/learn that a libertarian form of government tends to be the most ideal in all manner of social and economic policy (a view is backed up by history IMO), and that it is fundamentally highly moral and logical, and that this can be demonstrated with fair and reasoned debate.
This said, I think that most people - inclucing many highly liberty-minded people - have some doubts or questions about the ethics or workability of a highly libertarian form of government in our modern times. As such, I welcome any questions or comments related to the issue so that I might either clear them up, or that I might correct any misperceptions should flaws in my understanding or a better way forward be shown by said questions and comments...

"It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle

In religion and politics people's beliefs and convictions are in almost every case gotten at second-hand, and without examination, from authorities who have not themselves examined the questions at issue but have taken them at second-hand from other non-examiners, whose opinions about them were not worth a brass farthing.
- Autobiography of Mark Twain
"Common sense is the collection of prejudices acquired by age eighteen."
"The important thing is not to stop questioning. Curiosity has its own reason for existing."
"The whole of science is nothing more than a refinement of everyday thinking."

In general, libertarianism refers to the belief that government should be strictly limited to upholding and protecting individual rights and freedoms, which generally includes a military to protect borders, and a police force and court system to deal with criminal behavior. Everything else should be left to the people to deal with on their own without government oversight.
That said, many people here (myself mostly included) go even further, believing that no government at all is necessary or advisable, which is also known as "Anarcho-Capitalism", or simply "Anarchism" as many people describe it. It should be noted that "Anarchism" in this description does not imply a dangerous and/or lawless environment, as Anarchic theorists believe that people - likely through insurance & rights protection agencies - will resolve this issue effectively and relatively harmoniously without any unconsented to governing agency.
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For those interested in having questions about libertarianism answered - either their own or those that others have brought up, I propose this thread.
I have studied the topic for a while now and think I have covered most of the bases to some extent, and am willing to devote some time to relaying what I have learned if people wish to ask questions of myself or others here.
If the conversation gets too long in this thread perhaps it can be copy/pasted into another thread dedicated to that question, though with only 11 members at the time I am posting this I doubt this will be a problem right away.