so we're back to those pesky references
So who are all these libertarian and conservatives economists who are in the mainstream and say the Bush tax cuts were well designed? You have a few on the fringe like Lew Rockwell but they criticise Bush as much as anyone. Clearly you can't find any rferences or you would have posted them. You should be wondering why no one in the proper science is supporting Bush's policies, and if not then where did Bush get the ideas from.
The simple fact which you try and dodge over and over and over again is that Bush's economic policies are not approved of by economists except for a few lunatics like Grover Norquist. Now that his policies didn't work all he can claim is that things were very bad and his results were all that can be expected.