They took out Nixon because he was literally purging Jews from the government #1

Haldeman:
I said, "Who were?" You said what?

Nixon:
I said, "Are they all jews?" He said "Yes."
Malek is not Jewish...

Haldeman:
No.

Nixon:
Allright. I want to look at any sensitive areas around where Jews are involved, Bob. See, the Jews are all through the government, and we have got to get in those areas. We've got to get the man in charge who is not Jewish to control the Jewish... You understand?

Haldeman:
I sure do.

Nixon:
The department is full of Jews.

Haldeman:
I sure do.

Nixon:
Second, most Jews are disloyal. You know what I mean?
You have a Garment and a Kissinger, and frankly, a Safire. But [by God, they're exceptions.]
 

In our opinion, the exceptions, unscathed by the Watergate scandal, burned him.