Learn what "i don't understand how someone can do that" means, when people say it, and how to use it naturally in English.

It means the speaker is saying they can't make sense of the person's behavior.
From The Missing Piece, Episode 53
Someone reacts with disbelief after hearing about a bad or shocking act.
Use this to express shock or moral disbelief in conversation. It is common in arguments or when reacting to something upsetting.
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