Well then, why do libertarians agree with the LP platform? Or rather, why don’t people who call themselves libertarians but disagree with the LP call themselves something else? It’s like calling myself a communist but then claiming that I disagree with what the Communist Party says.
I disagree with it on abortion (the reason Ron Paul is not a Libertarian) and immigration. There is the philosophy of libertarianism, and there is the Libertarian Party. Obviously, there is a huge amount of overlap, but they are not exactly the same.