But you’re really describing in the limit anarchism (‘I have more firepower’) not libertarianism. They can border on one another, and there people on the internet calling themselves ‘libertarian’ who are comically extreme. But if say you looked to the platform and statements of recent Libertarian national candidates their program would not include for example eliminating anti-trust laws. In which you’re also yourself mixing stuff together. In “the 1920’s or 30’s” there wasn’t “no government” as you state at the end. And the 1930’s was a time of unprecedented expansion of govt power in the US, for better or worse, but that makes the reference more confusing.
I, though I don’t consider myself ‘libertarian’ mainly, can see a difference between a baseline where govt sets out neutral rules (laws which say individuals can’t gain advantage over other law abiding individuals via ‘more firepower’, people cannot create monopolies, etc, besides rules which enforce contracts and basic property rights) but is not proactively involved in insuring particular, economic particularly, outcomes.
And even more practically Libertarian Party libertarianism in the US is practically mainly about greater social freedom (to take drugs etc). On the economic front it tends to be similar to old line liberal Republicanism (in 2016 it ran a pair of ex-Liberal Republicans, Johnson and Weld for P and VP) in opposing big increases in govt involvement in the economy the Democrats now tend to favor in general, and opposing the trade protectionism now increasingly prominent in both major parties. Johnson and Weld were not proposing to radically cut back govt involvement in the economy.
So which ‘libertarians’, ‘No True Scotsman’ fringe on the internet, the L Party front men, Republican voters with libertarian tendencies? And again there is a different name for people who think we’d be better off with no govt: Anarchists.