It doesn't work for many people who think 'there's no victim', or 'the victim can afford it'

Lets say you board a train at an unmanned station with no ticket machine. Nobody checks your ticket. You then get out at a manned station, but can just walk off.

Do you buy a ticket? Many who don't will think "I don't need to", not "I just broke the law" or "I just committed a crime"

How about you instead also get off at an unmanned station. How many people will seek out a way to pay their fare?

You don't have to be a sociopath to not feel guilty.