<human>: Can you condense the text into three sentences or less?

This is a fairly non-remarkable story, but I felt the need to get it off my chest because I feel badly about it.  Maybe I'm overreacting.
  
After a Unitarian Universalist meeting today, I was perusing their library. I sat down with a giant picturebook called CAFO, about the negative effects of factory farming.  Soon after, a mother with two children sat down next to me.  One of them (I'm guessing around 8) kept looking over at my book.  I decided it might be a good idea to put it back since it contains some heavy subject matter, but for whatever reason I kept reading for a bit.  It was fairly tasteful and didn't include overly graphic images.  
  
After a few minutes, I got up and put the book back.  I noticed that the child, while his mother was reading to the other child, went over and picked the book up and started reading it.
<bot>: I may have introduced a young child to a graphic book about some very dark subject matter.  I hope I haven't hurt his mental health at all.  Am I overreacting to feel terrible about this?