Well seeing as you didn't have a valid ticket you were breaking the law so your argument is pointless. It's not as though Railway companies try to hide the consequences of travelling without a valid ticket after all.
..but by running services with such an insufficient number seats they create an environment where, you could argue, they tempt people to sit in first class. It's hardly the crime of the century BUT I would still encourage people to fight the rail companies as opposed to just roll over and accept their shoddy service, pettiness and aggression.