I mean the point of the argument is to try to find out if there is possibly a legitimate reason, not to assume there was and not explore removing the fence. Sometimes no there was no good reason. Sometimes there was but it’s no longer applicable.For example lots of religious dietary restrictions have reasonable health benefits, especially in a society before modern refrigeration and food safety standards. So while there was a legitimate reason, it’s not nearly as applicable anymore. Discouraging sexual freedom and promiscuity makes a lot more sense in a society without birth control and where every additional mouth to feed means someone isn’t making it through the winter. Less so in a modern society. And sometimes there are absolutely legitimate reasons that have just been lost to time (most commonly captured in the idea that most safety rules and regulations are written in blood)