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Should we exclude people from states actively fueling a genocide?
That’s completely unrelated to contribution to FOSS. The only way it would be relevant is for software projects that do some kind of filtering, so something like Lemmy might be an area where I’d hesitate to put someone from Israel, Gaza, Russia, or Ukraine into a maintainer/moderator/admin role because they could influence what content is viewed by users in a way that paints their country in a better light.
But someone from the US is fine?
The US also has some incentives here, but I’d say it’s far less likely to interfere than the ones I mentioned. As long as there’s enough variety (i.e. some people from the EU and other regions), it should be fine.