The goal was to raise revenue by raising taxes. It didn't work, they received lower revenue, period. If there is another explanation I'm sure you could come up with it. However, the UK government didn't come up with one so they lowered the rate to 45% because they thought it was the rate that caused it.
The problem is that I never fucking said that. In some cases raising rates will increase revenue, I'm not disputing that. The only one showing religious certainty about it is you. We may get higher levels of revenue by raising that top rate. For the UK the rates they used didn't work. They may work in our case.