Mistaken motive on Japanese detective shows

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I see this a lot on Japanese detective shows, where the person's motive for murder turns out to be mistaken!

For example, let's say a woman has a boyfriend, and they both have a friend. Let's say this friend falls ill and the boyfriend takes it upon himself to care for their ill friend. Then the friend dies because of the illness. For whatever reason, the woman blames the boyfriend for the death, thinking that he neglected his duties to care for their friend. She then murders her boyfriend for this, in a way that makes it really hard for investigators to know who did it/prove that she did it. The super-smart detective then comes on the scene and eventually solves the case, and then he reveals to the woman-perpetrator evidence that her boyfriend had actually done all he could to care for their friend: it's just the illness won in the end. The woman then falls to the floor crying, finally mourning her lost friend and regretting her murder of her boyfriend, as she has nothing to look forward to except a long time in prison for the murder.

Has anyone else noticed this trope?

Catching the culprit as the first person is generally not a very good idea in the genre unless you really know what you're doing.

It's just Japan's way of doing it. A lot of American shows probably have it too.