I'm reminded of this quote from Steve Yegge's platform rant[1]

   ... I'll argue that Accessibility is actually more 
   important than Security because dialing Accessibility 
   to zero means you have no product at all, whereas dialing
   Security to zero can still get you a reasonably 
   successful product such as the Playstation Network.

1: https://plus.google.com/+RipRowan/posts/eVeouesvaVX