Why do conservatives continue to deny the failure of Reaganomics?

The second source of higher taxes was Social Security taxation, which kept increasing, and which helped taxes go up overall. Not only that, but soon thereafter; when the Social Security System was generally perceived as on the brink of bankruptcy, President Reagan brought in Alan Greenspan, a leading Reaganomics and now Chairman of the Federal Reserve, to save Social Security as head of a bipartisan commission.