I propose the following strategy for you to try to clarify your thinking on the fourth statement:

1) Rewrite it as: (fill in the blank) economic reasoning has few virtues in its own right, but is leveraged as a rationalization for policies convenient to (fill in the blank).

2) Ask yourself how much political power Keynesians have if they don't even have the power to impose Keynsian solutions.

3) Fill in the blanks for the statement in (1) as it actually applies for those with political power.