The Daily Alta California, headquartered in San Francisco, ran from January 4, 1849 to June 2, 1891. I found four articles printed between March 2, 1850 and September 13, 1850 that related to the aftermath of the Kelsey and Stone killings in Lake County. All four of them were largely sympathetic to the local Indians–although Stone and Kelsey were killed by Indians at their ranch, the retaliation against any and all Indians, coupled with the acknowledgement of the cruel treatment both men had visited on indigenous folks, appears to have left at least some people uneasy with the Indian killings during this time.
“During the past week most outrageous acts of lawlessness and cruelty have been perpetrated in Napa by an armed body of Americans, who publicly organized themselves in the village of Sonoma, for the avowed purpose of exterminating the Indians in this valley and burning the ranches and lodges where this innocent and laboring people lived.” -Napa Valley, March 4, 1850. Signed J. W. B.
Kelsey and Stone were killed in December of 1849. The US 1st Dragoons attempted to retaliate immediately but were held back by both weather and official requests for more resources. The vigilante response, according to Madley 2016, was in effect between February and March of 1850.
This last article, from September, informs readers that the remaining Kelsey brothers left their Sonoma homes to head further north towards Humboldt Bay. En route they were met by Indians who stole all of their goods and provisions.