That excuse wouldn’t fly in a courtroom if someone helped a murderer (repeatedly and knowingly), even if they claim they gave them the weapon for self-defense. It’s proven the US govt knows what the weapons are used for, and they’ve been sending them continuously for over a year. It’s called being an accessory to the crime.
Btw the genocide convention explicitly lists under article III e “complicity in genocide.”
You’re ignoring the fact that the US knows the weapons are used for war crimes, have been used for war crimes before, and that they’re supplying ever more weapons despite this. If you give your kid a gun and you know he’s going to murder someone, and he’s done it before multiple times, you’re going to jail.