The statement doesn't mean to keep the status quo, its meant to encourage tracking down the "why" before tossing things away. If a society says to not eat pigs you can't just decide to one day toss out the law. For all you know the pigs of that region are infected and will make you sick. Throwing away that status quo before tracking down why might end up making things worse.
Best one can do is where it clearly gets in the way of doing what YOU need to do, try to tear it down, but with one look over your shoulder to see if anyone is coming to get you for doing it.
If they do, they at least feel a need to keep it, even if nonsensical to you.
If no one does, then apparently no one remembers or cares enough to keep it there, so entropy wins and put it goes.
Might be a mistake, but might not be - and at least your problem will be easier to solve, which you concretely know and can experience, which is something.
Even if the pigs themselves were fine, perhaps there are other benefits that come from not eating pork.
I'm not an expert by any means, but I could definitely see how eating Kosher could have helped prop up Jewish businesses in the areas where they were a minority.