Their self serving reasons are irrelevant. The results can be moral even if the players aren't. The key is to somehow prevent any one of them from dominating completely so we can play them off one another and keep reaping the rewards. If China's undermining efforts achieves that, so be it. The fact we're getting permanent access to powerful models as a result is nothing short of awesome.
In order for us to win, neither China nor the US can win. The ideal situation is the one where they exhaust themselves trying while we benefit by picking up the pieces.