"California imposes nighttime COVID-19 curfew but some resist"
---Don't go out at night, the virus might get you!
Kidding. It's all about control, not the virus. I'd be willing to bet that the primary reason they're doing it is because they've seen it in movies. They're deformed brain doesn't understand that the government is always the bad guy in those movies.
"... sheriffs of some counties say they won't enforce it."
---Good, a few might actually understand their oath. Not enough though, I'm sure, and only in the "red" counties.