'SOME lefties don't understand macro economics' is like 'that dress makes you look fat' because it singles out the particular fat girl like the designated lefties are singled out by the use of the qualifier 'some'.
Teaching right-brained reasoning to a leftist is like teaching most men to clean thoroughly. The smart ones will be able to dig what your saying and perform to proper standards if they want to continue getting laid, but relating to how thorough cleaning makes a woman feel is not going to happen. The beautiful goal of our system is to glean the best of all sides, something sweeping generalizations inhibit.
P.S. - I understand macro economics just fine, thank you very much, I simply see the results of the study and the predictions yielded by them in a slightly different light than many self described 'righties'.
Ah, but you see, 'that dress makes you look fat' does not always infer that the person wearing it is fat. It likely infers only that the dress is unflattering.
Saying that 'leftists don't understand macroecoomics' does not imply that the left is stupid or ignorant. It only implies that the left doesn't understand how their concepts, ideas, and proposals fit into the consequences that are outlined in macroeconomics.
And because I do understand macroecnomics, at least as much as most lay people do, I don't think our system should be looking to 'glean the best of all sides.' Some sides we don't want period. Easing people into economic slavery is only slightly less painful than shoving them brutally into it--think Obamacare or Cap & Trade--but the end result is economic slavery. Sometimes there is no side worth embracing.
Those who understand macroeconomics can look at such programs and see the dangers. Those who cannot--and that will more often than not will be the left--see only the positives and can ignore or blow off the negatives as 'worth it' for some vague altruistic concept they imagine.
That in a nutshell is what separates rightists from leftists in America.
The right accepts short term pain, even if it may include going against their own personal interests, in order to achieve a long term goal.
The left embraces short term comfort in trust that there will be no pain as a consequence for it.
The right wants to govern themselves.
The left wants a central power to govern everybody as the left wants it to govern.
Disclaimer: Statements here are rhetorical and do not imply there will be no exceptions within any group.