Yours is a 21st century judgment, but don't forget that it all happened ages back, when segregation was a very real and actual problem. Surely you can't blame him for being pissed with with the slow and seemingly ineffective way of doing things of all the 'super harmony blah blah' groups.
I mean, put it this way, if you're the disadvantaged (severely) party in an oppressive regime which upholds (the south at least) segregation, what would you do?
"ages ago"? Not so long ago.
That attitude is a cop-out excuse for violence, criminality, and racism (not to mention utter lunacy).