No one is really truly a libertarian. People can’t trust a libertarian system at this point in our evolution. Libertarianism is an ideal, like perfection. We want it and work towards it. Trump is way more of a libertarian than most other politicians.
To me Libertarianism as an ideology is as unworkable as Communism in reality.
The principle of none initiation of force sounds great on paper. Except people who have greater force are always tempted to use that force to their advantage. So you have to have greater force ready to stop them. But that’s the rub, those that wield that force will also be tempted to use it against others.