There is a difference between blaming and saying things might have been different.
The blame lies with Hitler and his policies, one of which was disarmament of the public.
Actually, Ben Carson is right on the money.
One qoute attributed to the camps is something to the effect of “If only, when they had sent the SS door to door, a few of us had open fired and made the rest of them afraid to do their job, we might not be in this mess.” - paraphrased
Well, “the public” was not disarmed. On the other hand
Regulations Against Jews’ Possession of Weapons
11 November 1938
With a basis in § 31 of the Weapons Law of 18 March 1928 (Reichsgesetzblatt I, p. 265), Article III of the Law on the Reunification of Austria with Germany of 13 March 1938 (Reichsgesetzblatt I, p. 237), and § 9 of the Fuhrer and Chancellor’s decree on the administration of the Sudeten-German districts of 1 October 1928 (Reichsgesetzblatt 1, p. 1331 ) are the following ordered:
§ 1
Jews (§ 5 of the First Regulations of the German Citizenship Law of 14 November 1935, Reichsgesetzblatt 1, p. 1332) are prohibited from acquiring. Possessing, and carrying firearms and ammunition, as well as truncheons or stabbing weapons. Those now possessing weapons and ammunition are at once to turn them over to the local police authority.
§ 2
Firearms and ammunition found in a Jew’s possession will be forfeited to the government without compensation.
§ 3
The Minister of the Interior may make exceptions to the Prohibition in § 1 for Jews who are foreign nationals. He can entrust other authorities with this power.
§ 4
Whoever willfully or negligently violates the provisions of § 1 will be punished with imprisonment and a fine. In especially severe cases of deliberate violations, the punishment is imprisonment in a penitentiary for up to five years.
§ 5
For the implementation if this regulation, the Minister of the Interior waives the necessary legal and administrative provisions.
§ 6
This regulation is valid in the state of Austria and in the Sudeten-German districts.
Berlin, 11 November 1938
Minister of the Interior
Frick