Auditors consider the risks of material misstatement $($MM$)($i$.$e$.,$ Inherent Risk $($I$/$R$)$ and

Control Risk $($C$/$R$))$ because:

Auditors want to lower the risks of MM$.$

When the risks of MM are high, detection risk is high.

$\frac{\text{I}}{R}$ and $\frac{C}{R}$ arise from the same circumstances.

Auditors design substantive procedures in response to those risks.