You said — “presumed innocent” ONLY in the court of law.
Actually no, they are presumed innocent *not* just “in the court” as a matter of some “legal wording” valid only for when a person sits in that courtroom and just in front of the jury — but — they are presumed innocent *period* — at any time prior to an *actual conviction* by a court. You see, it’s the *conviction* that *legally* (in all phases of one’s life, inside and outside of the court-room) ascertains that “fact”.
Prior to that time — you are *just as you were* as a normal person (of course, people do have to deal with bail, but that’s for purposes of making sure you appear at trial rather than any determination of guilt).
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And then you said — “Why do you not know that?”
Well, it’s very simple — when you said — “If society really had to follow the ‘presumption of innocence’ we would never arrest anyone!” — it became clear that you didn’t understand how it worked...
Please. The phrase 'presummed innocent .....' has a very specific legal meaning valid only in the courtroom. I have every right to presume someone guilty before their arrest, before their trial and after their trial. For example, I do not presume that O.J. is innocent of murdering his wife.