The US attack on that school is atrocious and I condemn it. While possibly a war crime, it does not meet the definition of genocide, unlike Israel's conduct in Gaza, which certainly does. There's no evidence of recent US conduct amounting to genocide (much historical evidence vis-a-vis American Indians though).
To the extent you wish to penalise complicity in genocide, go for it, but I will notice if you're oddly selective in which genocides you apply that standard to, and which you don't. (Which countries traded with Burma during the Rohingya genocide? Do you know? Do you care?)
> brown children
What does the children's colour have to do with anything at all? Do we grade the severity of war crimes by the (perceived? assigned?) race of the victim? Horrific thought.