> the libertarian creed -the churlish assumption that 'rules are the arbitrary imposition of those with power' and that somehow breaking them is more likely good than not

This is certainly churlish, but it's not at all "the libertarian creed". People who break rules just for the sake of breaking them aren't libertarians, they're idiots. I agree there are lots of those around, and that many, if not most, people who crow about "breaking rules" are doing it for selfish or irresponsible or self-aggrandizing reasons. But those people aren't libertarians.

The libertarian creed is that there are different kinds of rules, and you treat them in different ways. And one key part of that is precisely the "moral concern" that you talk about. Libertarianism includes the non-aggression principle: don't violate other people's rights. (Some, including me, would say that's a bedrock tenet of libertarianism.) If breaking a rule would do that, you don't break the rule. And indeed lots of the rules we have in place in our society are there for that very reason--because breaking them would mean violating someone's rights. That doesn't just include obvious cases like the laws against things like murder. It includes rules about fiduciary responsibility when you're taking care of other people's money (someone mentioned Paypal upthread). And it includes norms that aren't codified into rules, like "don't take your users' data without their consent or even knowledge, and then sell it for profit". Doing it at scale to billions of people, as tech giants do, doesn't change that, and "libertarian creed" isn't a get out of jail free card.

You said it better than I would have. GP has a misunderstanding of libertarianism and perhaps of the concept of liberty.

Libertarians (small-l libertarians, colloquially) don’t break norms “just because”, they do it only in specific circumstances based on a calculus. Everyone’s calculus is different, but the usual reasoning would focus on possible infringement of others’ rights when breaking the norm and the seeming validity/grounding of the norm. And perhaps the risk tolerance of the individual and likely consequences.

GP seems to be taking about anarchists (and a particular species of anarchist at that). There is indeed some overlap but libertarians are not allergic to norms. “Rights” themselves are a norm.