Negative treat

We are in for a negative treat on Monday with Wall Street tumbling by 1.6% last night.

Because the world economy is not that healthy (European malaise, Japanese spurt stuttering and China slow down) and only the US showing progress, the US interest was kept at zilch.  Most institutions are extremely worried about rising interest rate in America.  However, I think that is extremely foolish when investing for the longer term.

American interest rate rise would indicate that EVERYTHING is well so why worry about a tiny increase in the interest rate when the economy is doing well?