Kazan was involved in an important event during an important period in American history.
And, almost alone among his peers, he did the right thing.
I, too, believe he did the right thing.
Unfortunately for Kazan, he made a lot of personal enemies in his lifetime. I have personal knowledge of this from years of sitting in on Actor Studio classes in the 70s & 80s. He was incredibly nasty to the vulnerable young talent who came before him. (Joe Mankewicz was no better). The only nice member of the Studio was Shelly Winters and those two guys spent plenty of time putting her down.