War has its own rules, Toffee
It happens from either side and they always cry that the other side kills civis.
Whatever, sometimes people die in war y'know.
Exactly I don't think you find many people that would complain about allies bombing Nazi German civilians in cities.
"The SOHR attributed 83,500 civilian deaths to the regime of Syrian President Bashar al-Assad and its allies, including Russia; 7,000 to Syrian rebels and allied forces; 3,700 to Islamic State of Iraq and the Levant (ISIL); 920 to the U.S.-led coalition; and 500 to Turkey."
UK based organisation, also doesn't really include the fact that rebels use hostages that Syria than kills with air strikes.
Civilian casualties are an unfortunate reality of armed conflict, but I would assume if rebels are using your own civilians as hostages, you would try to deal with it in a different way than killing 83,500 of them. That's genuinely insane.
Allies killing German civilians in WW2 was also unfortunate, but it was a large scale conflict, bombing was safest carried out during nights and they lacked the modern technology we currently have to make their strike more precise. If they did have that, I do think they would've made more of an effort to avoid civilian casualties.