There seems to be a certain type of human — and how this comes about in an evolutionary framework escapes me — who longs for stasis above all things.
Sometimes it’s easier to see than others. Medieval philosophers, for instance, had a beef with motion. “Motion” entails “moving towards” or “moving away,” which means that a moving thing lacks some perfection — if it were perfect, it wouldn’t need what it was moving towards, or need to avoid that from which it was moving away. The ideal was an utterly static universe.
Our modern liberals, as you say, are always redefining things. They seem to be defined by frantic motion; they even call themselves “Progressives.” But: what are they progressing towards? Their ideal world, too, is completely static. They trend autistic, so they can’t read social cues very well — thus, the idea that someone can be one way today, and through his own effort be something different tomorrow, stresses them out. They’re not very bright, so they need everything precisely defined. Because of this, they can’t handle nuance — witness their zeal for coming up with ever more elaborate micro-identities.
Follow that “logic” out, and you see that their ideal world is a giant cubicle farm — everyone in his box, doing (being) one thing and one thing only, forever, world without end amen. Government is simply the most efficient way to achieve this objective. If you load the ambitious up with enough red tape, they’ll stop innovating. Laws can silence the cantankerous, and as soon as we get those census forms juuuuuuust right, we’ll have a check box for every conceivable race/gender/orientation.
And then we can freeze the whole thing in carbonite and hang it on the wall, forever. And then we shall have utopia.
I need hardly point out that this explains Climate Change Fever better than anything else; what they ultimately desire is an Official Thermostat and a designated setting thereupon, after which no changes are allowed or even allowed to be contemplated.