Iran also support the killing of innocents in Syria and support a sectarian war against Sunni in Iraq. Iran is NOT even a bit better than of the country you mentioned so if you want to condemn any of the actions these countries did maybe you should have some consistency and condemn Iran as well.
Iran has been supporting Iraq since day one last year when ISIS invaded and started ethnically cleansing areas of any non-Sunnis (and now they've started killing any Sunni that goes against them). They've provided weapons, training and support to groups that consist of
Iraqis fighting for their country to not only protect the Shia majority who are frequent targets of ISIS but to liberate Sunnis IN Sunni areas under ISIS control including Tikrit, Baiji, various parts of Diyala and Anbar (ongoing process). The PMU, in cooperation between Iraqis and the assist from Iran, now consists of brigades formed of other minorities including Shabaks, Christians, Yezidis and even Sunni tribes. So sure, if you want to say that all those minorities including Sunnis kill Sunnis en masse, something which is bs then be my guest. GCC media and the western media tried so hard to paint it as a Shia militia group that was out to ethnically cleanse Sunnis (God forbid Iraqis ever having a right to defend their own country without being labeled something by some terrorist sympathizer or westerner abroad, guess they can't even defend themselves from ISIS without being labeled). When their bullshit didn't fit what the PMU did they tried report about crimes being reported from unreliable witnesses, even using footage from Syria showing ISIS looting homes as proof. When those reports stopped resurfacing and Iraqi Sunnis went back to their cities now free from ISIS, resumed their ordinary life and thanked the army and PMU western news outlets. toned down on it. Now that the group is even more diverse than before they've toned down even more. A fucking laughing stock, and what's worse is that they are seen as credible news outlets by the majority of the western world for the simple fact that they are western. It's like swallowing whatever shit RT, Fox News and Dailymail comes out with.
Stop talking nonsense and drop the bullshit from the western news about a sectarian war going on. ISIS invaded and killed countless of minorities back in 2014 (they did it for years before that but never mind). They killed over 2000 Shias belonging to the army in a day, a video they recently released to show proof of. What was the retaliation from the Iraqi Shia? None. The answer back was to defend the country and liberate Sunni Iraqis from ISIS, and that's including areas where the very same Sunni population had supported them. It is an extremist Sunni group killing any non-Sunni in Iraq. It is an extremist Sunni group killing Sunnis in Iraq. It is innocent Sunnis traveling to Shia areas in Iraq for a better and safer life, not the other way around. It is Iraqi Shia hosting those Iraqi Sunnis, taking risks of unintentionally helping ISIS fighters hiding among them which results in new suicide bombers and car bombs killing those very same Shia that helped Sunnis escaping from ISIS en masse. If there was a sectarian was going on they wouldn't fucking travel to Shia majority cities for protection. Seriously the western narrative can eat shit, there's only one thing going on: ISIS and it's supporters in Iraq vs Iraqis. Done. The western world and GCC can paint it as much as they want as a sectarian war in an attempt to fragment the country, but unless Iraqis want it to happen they, and believers like you won't.
Oh and btw:
U.S paid and bribed Sunni tribal chiefs that were allied and supported with Al-Qaida to switch sides and "fight" against them in Anbar back when U.S. forces were still in the country. When they left, money stopped rolling in and Iraq's govt. where having none of that shit (of bribing and paying terrorists money to not support terrorist organizations) Anbar went pro-IS again.
The Iraqi constitution US was actively involved in creating is sectarian to its very core, from the top positions of the government down to the military.
US talked about supporting Sunni groups and alike in Iraq directly without needing any permission from Iraq's central govt. There were talks about creating mini-states in the country, a proposal the administration rejected later. I guess it's not sectarian while the U.S. does it eh?
U.S. has among the most sectarian, repressive monarchies and dictatorships as allies.
"But Iran...."
Condemn your own fucking selves first.