I'm reminded of the Dream Team in '92, and both the sheer stomping they delivered (averaging 44 points more than their opponents among all matches) as well as the sheer joy the other countries had playing against the best American players. Yeah, they were all slaughtered, but they were proud to just have shown up against them, and there was a lot of respect on all sides.
On a PERSONAL basis, it's early in the World Cup and from a strategic position, after it got to 4 or 5-0 I would have told the girls to back off, but that's just to preserve their strength and not go all-out needlessly and risk injury in a game that's already won. Save it for the next rounds, as it were; take it easy and hold your lead and defend hard but don't do anything that might bite you for future rounds. But that's just strategy, and I'm all for this level of competition going to the bitter end.
Besides, God and Pele alone know what kind of wild, weird upset is gonna happen in minute 80.