Masks aren’t “the primary driver’ either. Masks are one of many variables.
Masks, distance, and being outdoors are some of the the variables we can control.
Age, variant, and weather are some of the variables we cannot.
Hey, check it out. Silent transmission is the primary driver.
No, it’s children, except when go to school or soccer tournaments because they become impervious there.

Health experts: children primary driver of COVID transmission
About 13 percent of the cases of COVID-19 in Douglas County are in children.

No, it’s young adults

Governor: Young Adults Are ‘Primary Driver’ of Coronavirus as Iowa’s Cases Become Worst in Nation
DES MOINES, Iowa — Younger people are a significant reason for Iowa’s current standing with the Trump administration as the worst state in the country for the spread of the coronavirus,…

No, it’s traveling

Worldwide COVID-19 spreading explained: traveling numbers as a primary driver for the pandemic - PubMed
The spread of SARS-CoV-2 and the distribution of cases worldwide followed no clear biogeographic, climatic, or cultural trend. Conversely, the internationally busiest cities in all countries tended to be the hardest hit, suggesting a basic, mathematically neutral pattern of the new coronavirus...

No, it’s stupid people in Southern California, which we all know has some of the worst winter weather anywhere.
Southern California is a main driver of state's record COVID-19 deaths, with no signs of a letup
Los Angeles Times, Dec. 10, 2020
No, it’s going to restaurants and the gym.

How to stop restaurants from driving COVID infections
US mobile data suggests restaurants, gyms and cafes can be COVID hotspots — and reveals strategies for limiting spread.

No, it is Marmalade-a-lago

Study Finds ‘Single Largest Driver’ of Coronavirus Misinformation: Trump (Published 2020)
Cornell University researchers analyzing 38 million English-language articles about the pandemic found that President Trump was the largest driver of the “infodemic.”