Her blog post starting out fine, but half way through, she decided she was more interested in mud slinging and shaming than having that discussion she so desperately wanted to have. It is left up to the reader to infer a motive for her choice in direction.
[0] Shaming I'm not so concerned about - a few of those tweet authors should definitely be fucking ashamed of themselves.
Thou dost protest too much, by the way.
If there are images of child sexual abuse being put on Reddit people can contact the Internet Watch Foundation (http://www.iwf.org.uk/)
There are other problematic images: non photographic images of child sexual abuse not hosted in the UK. I have no idea if these are on Reddit, nor what Reddit would do about those. Christopher Handley trials suggest that these are criminal and could cause trouble for Reddit.
And the sexualised (not not sexual) images of children are also a problem. Luckily Reddit has banned /r/jailbait and continues to ban similar subreddits.