Has the whole world gone nuts?
Half the world. This is craziness. Sounds like it was a robbery spree but not sure why he felt the need to stab so many people. Usually the threat is enough to get the loot.
Not one person, in the 10 locations reported, had a gun to shoot him. This is California after all (though in Orange County they are a little more liberal with issuance of CCW permits than other large counties it is still relatively rare - and the previous sheriff stopped issuing). It was not a “mass killing” in the traditional sense, it was a killing/robbery spree - the likelihood of meeting a defended target should have been higher.
I won’t jump to conclusions but we have a media and political class that have taken an extremely hyperbolic rhetorical position in the attempt to foment anger and hostility. Whether this played into his motives or not, these exasperated cries are uncivilized and could exacerbate already fragile individuals.