I love how things always become "accidental" when our side fucks up.
somehow that makes one feel warm and cozy inside.
The Syrian Observatory of Human Rights, while not a perfect source, lists the following for the US and Russia.
https://en.wikipedia.org/wiki/Casualties_of_the_Syrian_Civil_War
The US:
killed 6,213 people across Syria, of which:
5,359 dead were ISIL fighters,
147 Al-Nusra Front militants and other rebels,
90 government soldiers and
617 civilians.
Russia:
killed 9,364 people, of which:
2,746 were ISIL fighters,
2,814 militants from the Al-Qaeda affiliate al-Nusra Front and other rebel forces and 3,804 civilians.
So the US killed 9 ISIL/Al-Nusra militants per civilian (not making it OK to kill any civilians) while the Russians killed 1.5 militants per civilian.
It's not really comparable.
It's a whoopsy daisy accident when "the good guys" do it and an inhumane war crime when Russia does it.
It's not OK when either does it, but it's important to look at the regularity in which its done before trying to make the two seem equivalent when they're not at all.