This is because the rise in interest rate cannot slow down the too rapid economic growth.
Certainly, economic growth generates several reward to us including private sectors, government, household, investors and so on. However, too rapid economic growth may be caused by the speculation activities just like the Asian Financial Crisis in 1997-1998. Once we cannot confirm the economic growth is attributed by speculation or by real output rising, we use the rise in interest rate too slow down this extraordinary phenomenon based on the prudent method to stabilise our economies.
I hope the above brief explanation can help you understand the usefulness of interest rate by the FED.