In the context of the tests used to determine insanity, why is the ALI/MPC test considered the easiest standard for a defendant to meet?

Question

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The ALI/MPC test requires the defendant to demonstrate a lack of "substantial capacity" either to appreciate the criminality of their conduct or to conform their conduct to the requirements of the law, which is generally considered a less stringent standard than other insanity tests.

In the Context of the Tests Used to Determine Insanity