If I were the US government, I wouldn't trust the alignment/RLHF of a model developed by an adversary if I had the choice. Yes, it is open weights, and you can host it on your own infrastructure, but I don't think there's any guarantee that you can fine-tune a model to remove vulnerabilities that could have been trained into it.

I realize that non-US nations could ask the same about the US. All I will say is that there are consequences to failing to nurture a competitive tech industry - even Mistral is basing their newest models on China open-weights models. Unlike the EU, the US government is fortunate to have a choice.