"he acted in ignorance of basic facts and information"
synonyms: incomprehension of, unawareness of, unconsciousness of, unfamiliarity with, inexperience with, lack of knowledge about, lack of information about;
It is truly amazing how many times and for how many years the VERY Naive and IGNORANT WEST falls for the same deception by Islamists. Similar to the Palestinians hiding behind women and children so they can be killed and provide Islamic propaganda against Israel for the gullible WESTERN media.
Deception is the #1 weapon chosen by Mohamed & used by his followers now for 1400 years. Don't believe me – just read their 'bibles';
Qur'an (16:106)  – Establishes that there are circumstances that can "compel" a Muslim to tell a lie.
Hadith – Bukhari (52:269)  – "The Prophet said, 'War is deceit.'"
The gassing of the Syrians is right out of the playbook for these Islamists. You can be sure there are plenty of photos and videos for the gullible to once again be deceived.
Unlike most who have no idea about what they are talking about, I lived and married in Syria and Bashar Assad is doing exactly what our soldiers in Afghanistan are doing – killing Islamic Terrorists. Just ask MOST of the Syrian people.
For over 1400 years Islam has deceived the world into believing it was a 'religion' even though the historical record (270 million killed in the name of Allah) proves the reality of what it really is. (1) 
Maybe just once it would be nice if the media actually listened to a real Syrian instead of an Islamist President and a treasonous Secretary of State to see what's ACTUALLY going on! AND maybe just once it would be nice if the media and the Western people took just a few minutes and looked at the history of Islam and ALL the headlines from around the world everyday!
Here's a short list of just a few of those headlines. The links are all there but no need to read the articles. The headlines tell it all… Islam makes no bones about their desire to 'Fundamentally Transform the United States of America ' and the world. They 'walk the walk' as the link above shows. September 11th and the gassing in Syria is 'child's play' compared to what lies ahead if the West doesn't get their heads out of their ass…