I think this is problematic. Supremacy of the individual leaves no room for majoritarian decisions, typical in a democracy, since individual rights are not subject to legislation. On the other hand,the supremacy of the collective -- for example, a welfare state, a national project of the kind Germany was so keen on, or a social experiment of Marxism-Leninism require constant attention and adjustment by the state.
I guess I read this and was still thinking how that's not how it works in practice. It's precisely the "supremacy of the individual" which has resulted in a mandated Lowest Common Denominator.
Again, I'll use human life. The "supremacy of the individual"'s own morality or Personal Values results in the minority's view (particularly small militant faction) to not only become the law of the land but metastacize throughout the culture to polarize, obfuscate and further dehumanize the weakest lives of all at every end of the spectrum, not just the unborn.
It's inevitable that "The People's Will" sorts end up a tyranny of a minority's opinion ... for it's a given that, if the Individual has supreme sovereignty in all matters then all is relative. (All matters, that is, that don't affect another's person or property. This bit, too, hearkens to the rabid individualism that is defending actions because one is an Island. We're human beings, for Pete's sake. Nothing's further from the truth.)
So ... the reality of any given situation IS determined by majority rule -- of committee or Supreme Court, even. (Executive Orders don't count.)
So-called Self-Evident truths (a mother "with child") are forcibly evolved ... primarily via the Mandated interpretation or end-run catch word: the "Living" Constitution ... so they meet with the satisfaction of every possible Individual take and support without distinction his own Personal Values.