He didn't just "compare" them, he implied they are the same. A common misuse of the verb "compare." The real news is that he is being probed. Such "comparisons" (or rather equivalence assertions) have become routine by now.
The University of California, Santa Barbara, is investigating allegations of improper conduct and anti-Semitism against a professor who compared Israel's treatment of Palestinians to the Holocaust.
Sociology professor William I. Robinson sent an e-mail to 80 of his students in January that contained photos of Jews killed by the Nazis and similar photos of Palestinians killed in the recent Israeli offensive in the Gaza Strip. The e-mail used the terms concentration camp and genocide when referring to Gaza.
Two Jewish students quit the class and filed complaints. Jewish groups also have complained.
Robinson, who is Jewish, argues that he was within his rights of academic freedom to challenge students with controversial topics.