Thank you: I needed to hear that. Part of my brain likes to keep scheming about "more absolute" ways to keep them out (and thus avoid any clean up). Your poi

Thank you: I needed to hear that. Part of my brain likes to keep scheming about "more absolute" ways to keep them out (and thus avoid any clean up). Your points suggest that my utopia-philic thinking is probably less useful than accepting that some clean up is just a necessary overhead (cf: "Eternal vigilance is the price of liberty."). Thank you.