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It seems like the problem here is that you had a new kid, and then demoted your older family members.
While Google might be bowing to pressure here, they shouldn't have to. Users have no reasonable expectation of privacy for information that is broadcasted unencrypted through the air.
In my experience, these books always refer the reader to actual research if they're interested. It's no one's fault but the reader's if they develop an impression of expertise without even reading the original research papers.
With regards to low-quality comments in posts you see, that can be dealt with one of two ways.
First, you can personally ignore a new user who makes inane comments. I've ignored as many 'jerk users as I can, so I will never see their comments (or posts) again.
Second, the users in your feed can ignore them. Ignoring a user prevents them from commenting on your posts, which gives you some measure of control to the discussions happening on your posts.
If these methods become insufficient, I fully believe that mk will develop a better system.