Since nobody here has actually read the article, it states that the reason the posts were taken down was "prohibits incitement to terrorism praise for acts of terrorism and identification or support of terror organizations." This type of speech (incitement) is illegal in the United States and support is very borderline depending on the type and meaning of "support". Now, if the reason doesnt match the actual content removed that should definitely be addressed which is your point, but I think that the reason is valid.