Do you have cause to believe "nothing to hide" is a partisan position? I'd expect that half of such people are on the left and are critical by default of the new administration. Seems to be supported by the second chart here: https://www.pewresearch.org/internet/2023/10/18/how-american...
In real life, I hear people of all political stripes embracing positions between "nothing to hide" and "the govt can find out my personal info anyway, so why not email it directly to nameless scammers overseas?"
Online it works like most things. Everybody pretends it's a partisan food fight, even if they have to lie.
It’s a position held by extremists on both sides and the natural ally of extermists, the lazy.