I suspect this survey is finding what it wants to find, to justify funding, policy lobbying etc. It's unclear how the question in question was phrased, and what the multiple choice answers were, if any. Are they including "somewhat", "don't know"?

Do I think that "jews caused the holocaust"? It depends what you mean. This is a bit like the Bill Burr bit about hitting women. People shouldn't do it, but sometimes something leads up to it.