The black community is diverse in opinion, and most black americans are willing to say that no, not everything black people go through is due to whites.
i don't know a single black person who says that much.
but white racists really don't talk to us and are insulated in their own little bubble, so they think "blame whitey" is the only viewpoint ever.
Truth is, black people are highly self critical towards ourselves. Anyone who has bothered to get to know black people on a deeper level would know this.