Of the three tests 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" to appreciate the criminality of their conduct or to conform their conduct to the law, which is considered a less stringent standard compared to other tests like the M'Naghten Rule or the Irresistible Impulse Test.

Of the Three Tests to Determine Insanity, Why Is the ALI/MPC