The courts are for determining whether someone should go to jail. But anyone can draw conclusions about whether or not they want to deal with someone who is accused of a crime.
Someone might be accused of child molestation, but never stood trial. Would a parent then be obligated to be ok with the accused being alone with their children since 'hey he's innocent until proven guilty'? Should someone who had been credibly accused of many instances of sexual misconduct be trusted as if they are a model citizen?
The presumption of innocence is there to ensure someone gets a fair trial in court. It doesn't mean everyone else has to ignore evidence of criminal conduct until a conviction comes down. It also doesn't always mean that someone who was found not guilty by a criminal court, didn't actually do what they were accused of. It just means the court didn't find guilt beyond a reasonable doubt.