You seem to be reading this as "Google knew about an exploit and could have fixed it, but instead chose to leave a cute message." To me, it sounds more like Goo

You seem to be reading this as "Google knew about an exploit and could have fixed it, but instead chose to leave a cute message." To me, it sounds more like Google knew what kinds of exploits people were likely to try and put in code that would detect some attempts and give a cute error message. The fact that Vupen later succeeded with a similar exploit basically just proves Google hasn't solved the halting problem, not that they intentionally left an exploit in (unless you consider Abobe Flash itself to be an exploit).