The author of this statement would most likely support "Separation of powers", since this system, which is employed in the United States, makes sure that no single branch of government becomes too powerful and therefore tyrannical.
Answer:
Germany wanted to open a front in the Americas. With the "distraction" of Mexico attacking, it may lead to US cutting off supplies and troops that would have gone to the Western Front to fight to defend their own homeland. As the Allies were heavily dependent on US products & material, this shortage of supply would lead to a weakened front, easing the front for the Germans to take advantage of.
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He might be sent to a mental institution because he is afraid and scared. He might have a medical condition or he might try to hurt himself to avoid whatever he went to trial for. People could also just think that he was crazy.