Because it's just one part of a huge deal involving a lot more than copyright. NZ wants to get into the Canadian dairy market. Australia wants to be able to s

Because it's just one part of a huge deal involving a lot more than copyright. NZ wants to get into the Canadian dairy market. Australia wants to be able to sell sugar to americans. Every country has things they want, and things they don't care about that they're willing to give up in exchange for the things they want. It seems that agreeing to the American's copyright demands mostly falls into the "things we're willing to give up" category.