The Fed is more willing to balance risks in favor of growth than it was two years ago. They really don't want to be accused of anti-growth. They want to be seen as anti-inflation, and I don't think in that light they wanted to be seen as moving ahead of inflation reports that have not shown any acceleration.
Quotes about anti-inflation (2 Quotes)
The Fed is saying that 'we're being tested here, we're being tested on our anti-inflation credibility,' ... They need to sound tough. They need a pretty good bark to go with their bite.