[sneak]

Yes, this is entirely permissible by society and people who know them. Violence undertaken by the state to enforce the law is a different matter, where the maxim of the law is "innocent until proven guilty".

The topic of this thread is not law enforcement by the state, however.

There are people I know who have been credibly accused of crimes. No trial occurred. I still treat them as if they were guilty of the crime: I assiduously avoid them.

Such is my right.