Earlier quoted context omitted.
What's more libertarian than calling the police when someone misuses and infringes on your property?
Libertarians (at least consistent ones) call out intellectual property for what it is: government monopoly. In libertopia... Aaron would only face life in prison if he entered into a contract with MIT agreeing to life in prison for accessing the systems in the way he did. In libertopia... you cannot consent to terms you cannot negotiate (IE accessing a website does not magically enter you into some agreement).
Second, the root of the CFAA charge wasn't intellectual property, but physical property: MIT's network. Libertarians certainly do recognize non-contractual violations of property rights, i.e. various incarnations of trespass.