You can probably cite all kinds of reasons for the economic collapse in 2000. There are so many variables that affect economic stability that it's really difficult to analyze what went wrong, so from that perspective I agree with you, it's not just the president's fault. However, we can look at basic economic trends, like the fact that the economy is cyclical. With economic growth, you want stability, not exponential growth, and what we experienced in the 90's was in fact exponential growth. As a result, we had a strong correction.
In my opinion, it is the job of the president and his staff to encourage stable growth and to discourage unsustainable movements through economic policy.