That doesn't imply it's good law that well-trained lawyers believe is correct. If anything, the prevalence of lawyers who aren't on board with it indicates the contrary. But the federal legal system itself is not a democracy, and when we change a handful of key operators in the courts, the timbre of the law can change quickly.
You’re incorrect about both democracy and demographics. The legal profession is dominated by the ideology of a white liberal minority. Not only are there few conservatives, but the conservative views prevalent among Black, Hispanic, and Asian people are also absent. (This is a common mistake where people confuse minorities voting democrat for being liberal. Most democrats are not liberal, and “changing demographics” hasn’t affected that because most minorities aren’t liberal either.)
Modern liberal legal thought arose in the 1950s and 1960s to allow that ideological minority to change society in ways they couldn’t achieve at the ballot box. For example, both Republican and democrat lawyers and judges are much more secular than voters in their respective parties. Thus, the Supreme Court banned school prayer more than 70 years ago, but even as of 2012 a strong majority of Americans opposed that decision: https://www.pewresearch.org/fact-tank/2013/06/13/south-carol....
Another example is racial preferences in education and hiring. It’s the pet project of white liberals and their allies. The majority of non-white Americans, including Black people, oppose express racial preferences for both college admissions and hiring. (E.g. https://www.pewresearch.org/social-trends/wp-content/uploads...)
To be sure, the overwhelming majority of lawyers are liberal, and indeed the majority of very smart lawyers are liberal. But legal conservatism punches way above its weight in shaping the turf everyone is playing on.