But imagine, you are going to get on a train tomorrow and know that someone is going to reach into your pocket or bag and take your wallet. What are you going to do?
Normally I only carry about 50 euros so the thief might feel sorry and return the money... Probably not.
If I could I would reschedule and travel next day. If not I would probably travel with a previous train and try to avoid the theft.
But you would do something. These days, stealing a wallet is pretty risky I think - most people don't have cash.