In 2007, Brandeis University tried to discipline a professor
for
explaining the pejorative term "wetback". This led to a dispute
between the faculty senate, which defended him, and the administration
which judged that this was "harassment".
Hindley did not really make a racial slur, but what if he had? In
general, real use of racial slurs should not be formally punished.
Freedom of speech includes the freedom to say nasty and foolish
things.
Teachers are a special case, though; they should not gratuitously
insult their students and should not set an example of racism.
The faculty-administration dispute was resolved as the administration
agreed
to give somewhat more respect to faculty decisions, but Brandeis
never rescinded its
unjust
decision against Hindley.
In 2014, people
attacked
him for describing the Israeli occupation of Palestine as "ethnic
cleansing" and comparing it to the holocaust.
The occupation does include slow ethnic cleansing on certain parts of
annexed Jerusalem and the West Bank, but comparing it to the holocaust
is an exaggeration. Israel does not do things that would ever kill
millions of Arabs. Nonetheless, he has a right to say such things
on the faculty mailing list.