lec01 small fix

lectures/lec01.tex

@@ -107,9 +107,9 @@ \section{What is Security?}
 about security failures in the news, it is worth trying
 to understand whether the failure arose from a problem with the
 model, the goal, or the implementation.}
-%As such, the model and goal
-%cannot be ``wrong''---%
-The threat model might not have captured all of
+As such, the model and goal
+cannot be ``wrong'', but it may be that
+the threat model might not have captured all of
 the attacks that a real-world adversary can mount,
 and goal might turn out to
 not be exactly what we needed.