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Yoko's loyalty is to her family. One of the main reasons she is so loyal is because of how much everyone else in her family works, they all have lives that are more stressful than her. Yoko understands the most important thing in her life is her family and their support, without them she is nothing.
The behavior of an innocent person makes others think they are guilty. Often they act that way because of something else (adultery or secrets) but not the given crime.