Yeah, I imagine that's true. I bet being a train guard is frustrating. That said, I've seen ticket inspectors on london buses intimidate people into accepting fines when then didn't need to (I complain to TFL or whoever about it, explained what happened and confirmed my suspicion)... also in London, its rare to see ticket inspectors on trains into the city, but they all wait at the ticket barriers and fine people who walk over to the platform ticket booth to buy a ticket.
I ran onto the train once cos i was late for work, realised my oyster travel card was out of date by one day once I got to london bridge (the station i got on at didn't have barriers at the time) and I went straight over to the ticket place to get a ticket, totally willing to pay to get through the barrier, i got harassed by a team of ticket inspectors handing out fines to people legitimately wanting to buy tickets to get out the station. That's all they do. It's probably effective at bringing in money to the train company, but useless for keeping fare dodgers off trains.
I know a guy who was walking down a train and a guy had his legs over the isle and forced him to step over them... as he stepped over the legs the guy called him a pussy. This dude i know sat in another carriage getting worked up about it, then at his stop, walked back over to the 'legs' guy, grabbed a bottle and smashed it in the guys face and said "who is the pussy now?" before getting off the train. so people don't always get away with things but there is a right way and a wrong way to deal with stuff.