Is everyone entitled to benefit of the doubt (innocent until proven guilty)?

In today's political climate, if a person in party A is accused of wrong doing, the people in party B start treating him like he's already guilty and vice versa

If a famous person is accused of wrong doing, people start assuming guilt.

If a person is arrested for a heinous crime, people start calling for cruel methods of execution.

Should we not treat everyone as innocent until proven guilty no matter their political leanings, what they are accused of, or fame?

Is everyone entitled to benefit of the doubt (innocent until proven guilty)?
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