If someone is so mentally weak that they allow their opponent's slow play to affect their play, then they don't deserve to win the US Open....pretty simple.
I remember playing in the first round of a club championship about 10 years ago and the head pro addressed slow play before our foursome teed off that morning. Ironically, I was playing with three really slow golfers. Before I teed off, I got him aside and informed him that I could only play as fast as the other three players in our group. In other words, it would not be my fault if we played too slowly that morning.I saw this earlier.