Feet on seats

Walk through any half-empty London Midland train on the way home in the evening and you'll see people stretched out with their feet on the seats.  

Put "feet on train seats" into Google and you'll find stacks of links to national and local newspaper reports about people being taken to court for this by the train operating companies, but most of these seem to date back to 2007 whene there was a purge (they were particularly hot in Merseyside).  

Most of us will avoid sitting on an obviously dirty seat, and are presumably not happy about sitting on a seat where someone has had their feet (bearing in mind the chewing gum, grease, food remnants, bird mess, etc which litter the platforms).  So why do London Midland allow this to happen?  People do move their feet off the seats when the guard comes through to check tickets, but the new Desiro trains supposedly have CCTV so they have the evidence if they want to use it. 

It would only take the publicity arising from one or two prosecutions to stop this practice.