Hoppe's Mises Institute colleague Walter Block has characterized Hoppe as an "anti-open immigration activist" who argues that, though all public property is "stolen" by the state from taxpayers, "the state compounds the injustice when it allows immigrants to use property, thus further "invading" the private property rights of the original owners". However, Block rejects Hoppe's views as incompatible with libertarianism. He argues that Hoppe's logic implies that flagrantly unlibertarian laws such as regulations on prostitution and drug use "could be defended on the basis that many tax-paying property owners would not want such behavior on their own private property". Another libertarian author, Simon Guenzl, writing for "Libertarian Papers" argues that: "supporting a legitimate role for the state as an immigration gatekeeper is inconsistent with Rothbardian and Hoppean libertarian anarchism, as well as with the associated strategy of advocating always and in every instance reductions in the state's role in society."