The introduction by George Will to the McCutcheon case say it all:

The Supreme Court must feel as though it is plowing an ocean as it
repeatedly reminds Congress that the anodyne label “campaign finance
reform” can encompass a multitude of sins. Come Tuesday,  the court will have another occasion to consider that not all regulations of the indispensable means of disseminating political speech — money — are constitutional just because they are presented as means of preventing corruption or its “appearance.”
By siding with Shaun McCutcheon,
a conservative Alabama entrepreneur, the court can continue rescuing
the freedoms of political speech and association from abridgements
written by, and for, the political class.  More at the link.

Why is it that freedom always stirs the reform movement to fits?