XcodeGhost: Was Apple negligent?

Stop the presses! The venerable Apple App Store has been compromised! Yes, it’s shocking news. No, it’s not the end of the world. Don’t label me an Apple apologist, but there are some things to be said in its defense. And more importantly, there are some things to be learned from this event, both by Apple and others.
Certainly a good number of apps (4,000 or so, by some counts) on Apple’s App Store were infected with what has come to be known as the XcodeGhost malware. P