Couldn't agree with you more. They only have one track on their Disc: "tax cuts only favor the rich
The problem with your explanation is it's still too complicated for some liberals and the rest of the liberals don't care. If you can take this explanation and cut it down to just four to six words then you'll have a workable conservative parable you can counter the "tax cuts only favor the rich" montra with.
i.e.
Tax cuts for the deserved.
Tax cuts for the bill payers.
Reward the payers.
Feed only the horses who are pulling the wagon.
You don't need new horse shoes if you're not pulling the load.
Shut up if you're not pulling your load.
etc.#;^)