Billie, if the second shot was harder from the second fairway, why did players hit their tee shots there in the first place?
Jim,
Spider Miller explained this as did Gil on the telecast. A few of the US players had a left-to-right shot shape, and the thinking was that if they overcut the shot and ended up in the barranca, they would be dead (true). They felt more comfortable hitting their tee shot out towards the second, which gave them more space to miss. The rest of the team liked that approach, and so it was adopted by pretty much everyone one the team.
However, as Gil explained, they were basically deferring the risk to the second shot by not taking on the drive. Watching the morning foursomes on Sunday, I didn't see a group hit the green from the angle of the 2nd fairway, but no group made worse than a 5, so if their objective was to not make worse than a bogey, I suppose they succeeded.
For the US Open, the issue as others have pointed to is more about spectator flow and also hold-ups while those teeing off on 2 wait for those playing 17 to hit their approaches.