That is the topic of my latest Bloomberg column, here is only part of the argument, this one you really do need to read the whole thing (and carefully):
Trump’s supporters are indeed correct to point out that previous administrations also told many lies, albeit of a different sort. Imagine, for instance, that mistruths come in different forms: higher-status mistruths and lower-status mistruths. The high-status mistruths are like those we associate with ambassadors and diplomats. The ambassador is reluctant to tell a refutable, flat-out lie of the sort that could cause embarrassment, but if all you ever heard were the proclamations of the ambassador, you wouldn’t have a good grasp of the realities of the situation. Ambassadors typically are speaking to more than one audience at once, a lot of context is required to glean the actual meaning, and if they are interpreted in a strictly literal manner (a mistake) it is easy enough to find lots of misdirection in their words. Most of all, ambassadors just won’t voice a lot of sensitive truths.
Arguably those diplomatic proclamations are not lies, but they do bear quite an indirect relationship to the blunt, bare truth. Ambassadors and diplomats behave this way because they seek maximum flexibility in maintaining delicate coalitions of support over the longer run. And indeed it is correct to think of every incoming (and ongoing) administration of doing lots of “lying” — if that is the right word — of this sort.
These higher-status lies are not Trump’s style, and thus many of his supporters, with some justification, see him as a man willing to voice important truths. If Trump’s opponents don’t understand that reality, and the sociological differences between various kinds of misdirection, they are going to underestimate his appeal and self-righteously underestimate how much they are themselves mistrusted by the public.
Again, link here.