The idiom "a lot of the blame" means that someone or something is responsible for a significant portion of the fault, error, or problem. Full definition
Considering that he was often left to defend three midfielders on his own by the tactical setup, I have a very hard time placing a whole lot of blame on him, especially as it was proved a long time ago that he needs a partner. (sbnation.com)
«There's a lot of blame to go around,» says the shareholder, who requested anonymity as the firm has a policy not to comment publicly on its holdings. (canadianbusiness.com)