If your industry knows the weapons it is building will most likely be used for genocide (which, considering the US is now fully fascist and at Israel's beck and call, puts the likelihood at near 100%), then I'd consider it deeply unethical to continue selling those weapons to the US.

It is not unlike IBM continuing to assist the Nazi's with their computers. Yes, saying no would be a financial hit, but like... Take the hit? It's supporting genocide otherwise. And if that industry would collapse if it decided not to support genocide, then maybe they should find a different way to make money, otherwise that industry shouldn't exist.