I noticed that as usual most Caucasians are trying to put the blame on
the two black guys because they when attacked first, hit back by
calling Michael a "cracka"

Well, here is the historical meaning of the word as explained by some
educated white people back in that day.

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Chief Justice Stokes of the Colony of Georgia wrote, "The Southern
colonies are overrun with a swarm of men from the eastern parts of
Virginia and North Carolina, distinguished by the name of Crackers.

Many of these people are descended from convicts that were transported
from Great Britain to Virginia at different times and inherited so
much profligacy from their ancestors that they are the most abandoned
set of men on earth."17

So many desperadoes and others were sent that the American colonies
came to be regarded as Australia was to be after 1787 or Devil's
Island in our time. The celebrated Dr. Samuel Johnson said in 1769,
"They (the Americans) are a race of convicts and ought to be thankful
for anything we allow them short of hanging."18