What do English speakers exactly mean when they say:
I don't necessarily think that
I don't think that someone is necessarily a bad person
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This construction denies positively asserting something, while implying that the speaker thinks it probable, or at least possible.
I don't think that Joe is NECESSARILY a bad person.
The evidence presented or the situation under discussion does not prove that Joe is a bad person, and the speaker is not willing to assert that joe is a bad person. However, it is implied that the facts at least suggest that Joe is a bad parson, that other explanations are less likely.
I don't NECESSARILY THINK that people who say Bacon wrote Shakespeare are nuts.
They may simply be misled or have other reasons, but this is not a positive statement about such people. The speaker implies that it is more likely than not that such people are nuts, even if it isn't really proved.