People have absolutely no idea what "innocent until proven guilty" means.
It's purely a legal term which exists to guarantee people the right to a fair trial, that's it. It just means that you can't lock someone up without a trial. That's it. That's literally all it means.
It has zero bearing outside of the legal system, and very precise practical usage within it. And there are laws that very directly and explicitly permit the government and law enforcement to disregard the legal construct of "innocent until proven guilty" (mainly anti-terrorism laws, which make it legal for the government to sentence someone to imprisonment without a trial).
People have a very hazy idea of "innocent until proven guilty" as some kind of vague, general concept meaning "we should all vaguely agree to pretend that someone is innocent until they've been convicted and act like they're innocent regardless of proof, evidence, or personal experience." This is bullshit and based on total ignorance of the law, and woolly thinking and lack of logical thinking.
Obviously police and prosecutors could not do their job if they had to assume and act as though all suspects are innocent. The entire job of a prosecutor is to treat the defendant as though they are guilty.
There are numerous safeguarding laws and regulations that require people in certain jobs to assume guilt without conviction, if you're a headteacher of a primary school and a teacher has been arrested on suspicion of possessing CSA images, or accused by ten pupils of molestation, your legal safeguarding obligation is to suspend that person unless he is found innocent. So legally in terms of safeguarding the law says that it's guilty until proven innocent. Would anyone genuinely advocate that a person found with CSA should be allowed unsupervised access to young children during the months/years they're waiting for the case to come to trial? Of course not! When someone's behaviour has flagged a serious safeguarding concern, then legally it has to be a case of "guilty until proven innocent" in order to protect children.
And innocent until proven guilty has ZERO bearing on public opinion, absolutely none. If you believe that a celeb, or a person in your social network, or the bloke who runs the local pub, is guilty of something, you are 100% within your rights to hold that opinion and to make decisions based on that opinion. Innocent until proven guilty as a legal concept which is enshrined in law DOES NOT APPLY.
Obviously if you go around publicly stating that someone is guilty they could sue you, but that's an entirely separate thing.
In cases of celebrities, people really genuinely seem to think that "innocent until proven guilty" means that it's somehow illegal to hold the opinion that a celeb is guilty unless they've been convicted. Those people have the IQ of ficus.