Are you trying to argue that something that saved the government money did not contribute at all the the budget surplus, or are you just pointing out that the amount that Clinton's policies helped reduce the deficit had little effect on the overall debt?
The causation you speak of is not an absolute. It CAN happen, but it might not always happen, and it might also effect it in different ways at different times. Given the multitude of other things that effect economic growth, you can't just point to one and say "this is it, this is the cause".
Also consider how different tax rates are targeted at specific groups. Another big thing that effects economic growth is the distribution of wealth, which tax policies are designed to address.
What about the even older non-ideological tactic of taking one thing one member of a group does and applying it to every member of that group?