Is it really proof? I have used G+ only a handful of times, but posting has been incredibly simple -- to classify who should see your post you click in a box an

Is it really proof? I have used G+ only a handful of times, but posting has been incredibly simple -- to classify who should see your post you click in a box and select the groups who should have access to it. One of them is "Public." I'm struggling to see how someone intelligent enough to work at Google could not figure this out. Perhaps it was just an error caused by posting too quickly, or it wasn't an error at all.