Why does he kill the burglar, the con artist and the executives?
They knew nothing, why kill them???
The stupid have one thing in common.They alter the facts to fit their views not the other way
Light was evil enough to kill people who didn't believe what Kira was doing was the right thing. L's two employees had helped try to stop Kira so he saw that as punishable by death.
As for the Yotsuba group, who knows. With Higuchi gone Kira no longer had anything to do with them. Maybe it's just the simple answer, Light was a villain, he wanted them dead over something small.