...unless it turns out to be illegal to go for a run at night, in which case it's terribly unsafe, and there's no way for a person from a "legal to run at night" country to know without checking.

Now, you might say, "Well, that's ridiculous; there's no reason why it would be illegal to run at night," but I think I can come up with at least as good reasons for making that illegal as for banning chewing gum. Making things illegal when there is no obvious reason for them to be illegal creates uncertainty and doubt; mixing in life-altering punishments provides fear, as well.