They should have been prepared before the announcement like the Koreans were during the Rodney King riots.
WHEN ‘ASSAULT WEAPONS’ SAVED KOREATOWN
http://humanevents.com/2012/12/23/when-assault-weapons-saved-koreatown/
Korean store owners defend their business during the 1992 LA riots
https://www.youtube.com/watch?v=nzkBGQx3HAc
Armed Korean Merchants Protect Stores - 1992 LA Riots
https://www.youtube.com/watch?v=a6tmD0W5r4w
Actually, it was so wide spread back then dozens of Koreans business were looted and burned out before they got a belly full....
Thankfully since then the black areas of LA have turned into a majority of Hispanic and Asian etc..
Many blacks left LA and CA in the years following and headed to all points back east, the south, northwest etc...