These mobs are comprised of ignorant people stirred up by evil people. Mobs were out in Calcutta in the runup to independence. Mobs, who were out in Germany looking for jews, were stirred up by the Nazis. Black people were strung up by the Ku Klux Klan, too.
There is nothing new, I've seen it all before. Put it down to human nature's desire to place the blame on someone.
You can be a white man living in the UK and be victimised by other white men simply because you are poorer, of different religion, accent, whatever. I was a Londoner evacuated to the country and I know all about being different to the locals. I spent a bloody lousy two years there and was glad to return to London with the bombs still dropping.