Not quite sure how this is supposed to relate to 911 truth and a massive government cover up... the issue of the dust particulates resulting in illness has been a known issue for a long time... but I hardly see where they're "demanding a new investigation" into the events that day. Perhaps I'm missing something, perhaps you can point out the relevance between protesting the lack of oversight on health and a grand scale conspiracy?
What cover up? What grand conspiracy? They want to know the truth. Whch for some of them includes a new investigation.