https://www.bbc.co.uk/news/uk-england-london-62539973

Six convictions dropped for Vigil protestors.

The arresting officers on this occasion

1. were not very bright;
2. don’t really understand laws they enforce;
3. put govt interests before rule of law; and
4. don’t take criticism well.

As a defence the police probably thought they could have been “super - spreaders”