Should settlers get CanRetreatWhenCaptured="True"?

[historix69]

AI usually looses a lot of settlers to barbarians or human player. By changing the settler rules to CanRetreatWhenCaptured="True", settlers should behave like Great Persons which are teleported to an own city when attacked. (I did not test it.)

Changing the rules would remove a lot of fun for the human player who usually enjoys capturing AI settlers, but would strengthen the AI players.