Actually, the good Dr. Paul is at least the Fruitcake Rudy Giuliani is.
The difference is that Rudy is an meglomaniacal authoritarian fruitcake with severe narcissism and its accompanying grandiosity.
Dr. Paul is an ultra-Libertarian almost Anarchist fruitcake who has been infected by Ayn Rand, Von Mises and Hayek and with his education consisting of nothing more than physician's trade school, he doesn't have the necessary education to understand the fallacies of those writings (and doesn't want to learn.)
While both are fruitcakes, Giuliani is the much more dangerous one. He is the one with no ability to judge people (as a prosecutor he put away high ranking members of the Mob. As mayor of New York he appointed a mobbed up cop, Bernie Kerek, to the top police position in the city after being warned about him), the man who will tell any lie to get higher office and repeats the same lies even after being caught in the lie, and a man whose tenure as New York Mayor was marked mostly by corruption, incompetence, and ignoring the law and legally prescribed procedures.
In comparison, Dr. Paul is simply a passive fruitcake. His idea of the proper jobs for government are ....... (hear the wind whistling through the leaves as you listen for something to be there?)