Any time one of those "Quickly set up an OS X dev machine!" setup scripts makes the rounds, you can practically guarantee that the script disables Gatekeeper an

Any time one of those "Quickly set up an OS X dev machine!" setup scripts makes the rounds, you can practically guarantee that the script disables Gatekeeper and the file download quarantine because the author "found it annoying/useless/pointless/mai freedums". You end up with one guy intentionally shooting himself in the foot, and 100s of others running his "helpful" script and shooting themselves in the feet without even realizing it. Developers as a group are at least as stupid about security as everyone else.