People often have different views and opinions. The important information that is Henk missing because of his viewpoint is that "He doesn't know if Miep is captured too."
A viewpoint is also known as a point of view. It simply means a character or an attitude or the way a person thinks about a particular thing.
The above line is from the book, Anne Frank Remembered. This was an autobiography of Miep Gies. She was known to be the woman who helped the Frank family to live when they stay hidden for two years. His opinion was missing the key fact as whether Miep was taken too.
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