Who exactly was at fault for letting the banks lend money that was 5-10 times the amount that people could afford that lead to the housing market collapse?

The fault for allowing banks to lend excessively can be attributed to multiple parties, including regulatory agencies that failed to enforce strict lending standards, banks that prioritized profit over responsible lending practices, and mortgage brokers who incentivized risky loans. Additionally, the broader financial system, including investors and rating agencies, contributed by promoting high-risk mortgage-backed securities. This systemic failure ultimately led to the housing market collapse when borrowers defaulted on loans they could not afford.