"To shoulder the blame" means to take responsibility or accept the fault for something that went wrong. It is like carrying the burden of being blamed or held accountable for a mistake or failure. Full definition
To put it more simply: Who should we blame for this? (slate.com)
Why should we blame the one man who has scored 8 goals in the last 10 games and say nothing about those who have not scored in the last 10 games. (justarsenal.com)
He's now 29, and his career is almost over, so should he blamed for being ambitious? (justarsenal.com)