> if later killing animals for meat gets banned, people won't have anything to compare it to.
In the United States, I suspect that a combination of the 1st amendment and at least one religious tradition[1] would prevent any federal or state prohibition on killing animals for meat. Therefore, there will be people who have the experience to compare the two.
EDIT: Actually, I'm probably wrong, based on the precedent that a state may institute a generally-applicable ban on peyote and the 1st amendment doesn't protect individuals who use it in religious rites. https://en.wikipedia.org/wiki/Employment_Division_v._Smith#M...
In the United States, I suspect that a combination of the 1st amendment and at least one religious tradition[1] would prevent any federal or state prohibition on killing animals for meat. Therefore, there will be people who have the experience to compare the two.
[1] For example, https://en.wikipedia.org/wiki/Eid_al-Adha
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EDIT: Actually, I'm probably wrong, based on the precedent that a state may institute a generally-applicable ban on peyote and the 1st amendment doesn't protect individuals who use it in religious rites. https://en.wikipedia.org/wiki/Employment_Division_v._Smith#M...