Such as, people are taught not to use global variables, but maybe they weren't taught the reasons why not. The reasons (some of) would be polluting the global

Such as, people are taught not to use global variables, but maybe they weren't taught the reasons why not. The reasons (some of) would be polluting the global namespace, having unexpected things defined in unexpected places, and so on. At some point, it could save the programmer oodles of time to just use global variables. It could be a project with limited scope where polluting and things won't be an issue. The reason for superstitions at all are stopping people from doing something when they can't understand the reasons yet. It's hard to explain to a child all of the reasons why they should be a good person, and much easier to tell them Santa will give them presents, until they can understand why being good is inherently its own reward.