The tech won't exist In a vacuum though. Suppose this eventually gives the Chinese an edge in precision medicine, your hands might be clean as far as the messy work but unless you ban citizens from visiting how are you going to regulate the health products that will emerge eventually? We can bury our heads in the sand but eventually the rising tide will get our socks wet unless we have the foresight to prepare a little.
The genes won't care that the scientists playing with them were unethical. The only reason your attitude seems appealing is because nobody wants to believe eventually this strategy will give the Chinese a superior understanding of gene editing.
Since you're race-baiting anyway, illegal immigrants cost the country about 50 billion a year. This isn't felt at the state level because the funds come from the federal government. You're doing the same lazy math California does when it talks about how much it contributes while ignoring how much it was receiving from Federal SALT deductions.
Who cares about unintended consequences if you're the first person to study them? China gets to deal with a novel problem and will get novel rewards eventually because the west let itself get soft.
EDIT: To all the people making Nazi comparisons, we stole the atom bomb from the Nazis. Their science across multiple disciplines was on par or superior. We're smarter than them now because we /destroyed/ them. It's easy to surpass someone who's standing still. My point is that we need real strategies and plans if we don't want certain science domains to become irrelavent due to the restrictions we place on ourselves. "We beat the Nazis" isn't a real counter argument.
Maybe the UK and the rest of Europe wouldn't be so bad at building businesses if they stopped taxing revenue and focused on profits instead. I'm not complaining as an American since it keeps them dependant on our services but it seems silly. It's like they hate the idea of succeeding.