Lets look at them one by one:
* freedom to speak and publish - widely supported by voters.
* freedom to assemble - widely supported by voters.
* pornography - legal already, internet traffic data shows large percentages of the population view pornography. Little political support for changing those laws apparent among current voters, regardless of the moral issues many of us feel about the topic.
* sexual deviation - in the context of the times when the book was written the term included behavior which few in our society now think should be illegal, including what President Clinton liked to do. Obviously a contentious issue still for other kinds of sexual behavior, but politically speaking the position expressed by Rothbard is not far different from that espoused by many politicians today.
* prostitution - Ask the citizens of Nevada.
* violent invasion of someone else’s person or property is a crime - widely supported by voters.
* conscription as slavery on a massive scale - how many conservatives would support a mandatory 2 year "community service" requirement if President Obama proposed it?
* the mass slaughter of civilians is totally illegitimate - widely supported by voters, it is one reason our rules of engagement are so strict. Would the voters today support a candidate who proposed simply bombing the cities of an enemy to "break the will of the people"?
“Mass slaughter” is a canard when it comes to the USA. Unless you are accepting the anti-US propaganda of Nazis, Islamists and Communists as legit. As for conscription per se, remember the Second Militia Act of 1792, under the authority of none other than President George Washington? Equating conscription and slavery is another canard.
Are you seriously trying to get a conservative to accept pornography merely on the basis of it being “legal”? Same with abortion and prostitution (the latter called “porneia” in the Greek New Testament)? The Founding Fathers would unilaterally call for the hanging rope, the context perhaps being lost on those unfamiliar with Judeo-Christian symbolism within jurisprudence (a person hung on a tree is cursed by God). As for Clinto(o)n, no, conservatives will always excoriate his behavior as a rotten and fatal character flaw and not anything positive, and even destructive to the nation.
The Founding Fathers emphasized morality to prevent the USA from making the same mistakes as (or worse than!) nation-states (or even empires) of the past, which all rotted from within thanks to a decline in morality. As I see things (and as you are apparently confirming), libertarians do not support the moral pillars of the USA.