Okay, these people protesting are likely mostly Shias, Shiites... but I read an article and they are going to have a vote in Iraq in the next few months, on whether the country will continue to accept our troops or to force our 10,000 troops out of Iraq.
This seems a bit significant, for backup, this article seems to have a related discussion:
Tillerson: US could stay in Iraq to fight ISIS, wanted or not
By: Aaron Mehta   October 30, 2017
https://www.defensenews.com/pentagon/2017/10/30/tillerson-us-could-stay-in-iraq-to-fight-isis-wanted-or-not/
Also, for the record, the "Shia cleric Muqtada al-Sadr" who organized this protest, has called for Assad to step down in the past, I think that's important to mention, it's not like he's necessarily on Assad's side either and this is from a year ago.
Powerful Iraqi Shiite Cleric Muqtada al-Sadr Calls For Assad to Step Down Following Chemical Attack
By Callum Paton On 4/10/17 at 12:45 PM
http://www.newsweek.com/powerful-iraqi-shiite-cleric-moqtada-al-sadr-calls-assad-chemical-attack-581610