that libertarian idea was developed by RP and limited to his stance. Modern Libertarian thought started with Ayn Rand. Modern Political Libertarian movement started with Rothbard.
a. I, like Ayn Rand and many others, think that people should procreate based on their ability to feed their own children. Abortions are okay until the 3rd trimester. After that, abortions are okay only if the health of mother or the baby is in danger.
b. Individual liberty works only via private property, not via public property. Banning guns and limiting freedom of speech in public places like Fed buildings or public universities is okay with me.
c. Further development on libertarian thought is possible as well. For example, it may be reasonable to restrict private owners from torturing their own animals on their private land. That is an open area for debates.