#populist Carbon County returning to its Democrat roots by voting with the big city Democrats once again.
Seriously though why did it? IIRC correctly it was the only county in Utah that Swung R in 2016.
Something I've noticed in referendums is that formerly Democratic counties swinging to the Republicans will often still vote for the "left" position on ballot issues for years after they've flipped electorally. On Question 790 in Oklahoma, Coal County was the strongest "no" voting county, more so than even Cleveland County. The 2014 Illinois miminum wage increased fared especially well in placed like Calhoun County that are formerly Dem. Virginia's RTW vote also showed this trend.
The Missouri 2018 referendums show this too. Racist hicks will vote against their interest so long as the GOP screams bloody murder about black people kneeling, Confederate traitor statues and the like
There aren't too many racist Hicks in Utah.
In my experience, Mormons are far less racist than white evangelicals.
Carbon county isn't Mormon. Its pretty similar to Applachia in general.