I think the notion Lee Kelly is trying to capture in a word actually IS leftism. Meaning: if you go back to movements for popular sovereignty or opposition to monarchy which comprised the original left wing their political positions don’t map well to our current left-right US political spectra, but they do kind of make sense if you reduce leftism to universalist egalitarian distaste for and opposition to one’s inherited culture and institutions.

Wasn’t there a period, roughly from the recovery in the early 80s until the late 90s, when generally free market arguments, by economists aligned with both parties (including, as I recall, Summers and Krugman), held the upper hand in public debate? In the late 90s, as I recall, the “center” of public economic discourse shifted to the left, and Democrat-aligned economists (such as the aforementioned grandees) shifted with it. By some coincidence, the “center” seems to have shifted to the left continuously since the late 90s on just about every contentious public issue (with a post-9/11 detour on national security, of course, now long over).

Basically, in times of relative peace and prosperity, the media is the realm of the intra-tribal competition.

The right is good at inter-tribal competition. In extreme, they’re irrationally suspicious of outsiders, and fearful of being persecuted and subjugated by other tribes. They like to form righteous armies to defend against and attack foreign terrorism and barbarism.

The left is good at intra-tribal competition. In extreme forms, they’re irrationally suspicious of insiders, and fearful of being persecuted and subjugated by high status members of their own tribe. They like to form rag-tag coalitions of the “oppressed” to overturn the existing power structures.

This is why we always observe far-left movements “eating their own”. When they successfully overturn power structures, it isn’t long before their strong intra-tribal instincts kick in again and the cycle begins anew.

Interesting, while we have the word ‘xenophobia’ to describe extreme inter-tribal competitiveness, there is no technical counterpart for extreme intra-tribal competitiveness. The word ‘autophobia’ is already taken for another meaning. Normally, the left-wing counterpart to xenophobia is celebrated as healthy scepticism of authority, at least in academic contexts.

To be “effective” the first set needs to have political (public) influence, which they seem motivated to seek aggressively.
The second set seems limited in motivation to making their understandings available, but not enforceable.