If an Israeli hit squad kills someone in a McDonalds, we dont get on McDonalds case for not providing a safe and secure place for their customers. Not putting up a sign when the floor is wet is on them. Assassins is on the government. It's not clear to me why things being different in the software world is so obvious that not seeing why is silly.
Regarding Obamaphone, in the US there is a government agency responsible for such things. The NSA. It's tasked with securing US information infrastructure on top of its more known role of signals intelligence. It just happens to favour the latter over the former so its not about to share its stockpile of iPhone zero days with Apple.
If McDonald's advertised their hamburgers as especially safe from outside influence and you are assassinated by someone poisoning your McDonald's hamburger, people will probably be upset at McDonald's.
Regarding Obamaphone, in the US there is a government agency responsible for such things. The NSA. It's tasked with securing US information infrastructure on top of its more known role of signals intelligence. It just happens to favour the latter over the former so its not about to share its stockpile of iPhone zero days with Apple.