Why do some Muslims pray and fast but do bad things?

I know some people they wear hijab, pray and fast and read Quran everyday yet they slander people, hurt people (physically and verbally), and they have bad intention for people. Islam is about manners and also being honest and salah, fasting, quran etc. But well why some people read quran for hours yet they... show more I know some people they wear hijab, pray and fast and read Quran everyday yet they slander people, hurt people (physically and verbally), and they have bad intention for people.

Islam is about manners and also being honest and salah, fasting, quran etc.

But well why some people read quran for hours yet they enjoy hurting people, yet some people read quran for few minutes but they are honest and very nice?

Why those people wear hijab and pray in first place?
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