"People who break rules just for the sake of breaking them aren't libertarians, they're idiots. "
-> they're not breaking them 'to break them' - they're breaking them because the rule doesn't serve their immediate purpose.
Like 'talking loud on a train'.
People who do that are not doing so 'just for spite' (sometimes) but rather, the social constraint is too much for them in the moment.
They are putting themselves 'above the (social) law'.
Most of the time, people lack the self awareness and are oblivious to their own actions in this regard especially under the veil of an ideology.
In the more ideological sense, Libertarians are often opposed to 'regulations' on the grounds that it 'limits their choice' etc. but those 'choices' have external effects on those around them.
The Ego is the greatest deluder and it's why self awareness is so hard.
I believe this is the 'root' of what the author is getting at. The Egoic aspiration towards supposed 'freedom' is often an ideological guise for trampling on others and just the pursuit of raw, unhindered selfish desire.
But 'without awareness'. Or worse - 'suppressed awareness'.
That's the key factor here: the 'lack of self awareness' and the deep motivation for people to put themselves before others - that drives this.
You see it all the time in callous Executive statements - it's why they seem so 'detached' - in their minds they are not acting 'badly' or 'immorally' - they're just doing what's good for them (often under the guise of 'shareholder' ideology, which is rooted in classic free market liberalism.), without any kind of self awareness.
And why in some competitive systems, a sense of self awareness can be a detriment.
And by the way - this 'tension' is right at the heart of Adam Smith.
Adam Smith was deeply concerned with the moral outcome - he was a (Christian) Ethicist, before he was an Economist. He wrote more about the issues of power than comparative value.
Friedman is like Adam Smith without the 'self consideration'.