Consumers drive responsibility

Is it consumers that are driving responsibility, through requiring safe products made in a responsible way? This does play a significant role, in which case are B2C (Business-to-Consumer) companies more responsible than B2B (Business-to-Business) companies?

I understand that eventually B2Bs sell to consumers, and that consumer's requirements will work themselves up the supply chain to force B2Bs to be responsible, but in reality this is doubtful. However, if CSR is just commonsense, then maybe there is no difference, as any buyer of a product (be it a consumer or a business) will demand the same from the seller. However I would be interested in comparing how responsible B2B companies are compared to B2C companies.