Video of children dead from chemical warfare

Alarmingly, the Syrian authorities are really dragging their feet on getting UN inspectors to places where it is claimed atrocities took place. 

Why is use of such weapons necessary? 

http://edition.cnn.com/video/standard.html?/video/world/2013/08/23/pkg-pleitgen-syria-chemical-attack.cnn&iid=article_sidebar

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