Pam Anderson accosted on train

A man has been arrested in London after getting creepy and aggressive with Pam Anderson over a period of a few weeks, finally resulting in an incident on a train in which he tried to get close to Anderson and eventually got violent.  The man has not been named, but apparently Anderson has had a heightened security presence for several weeks after the crazy fan would not stop pestering her for attention.

The train incident happened over the weekend, with the man trying to confront Anderson but being stopped by her security people.  He was removed from the train by police, but he went nutso and attacked one of the officers.  They had to subdue him with pepper spray and physically carry him to a squad car.  What I don’t understand is, what the hell was Anderson doing on a public train if she knew she had a stalker?  This is what private cars are for.