Probably the best way to process it would be that it's so outlandish and foolhardy and unlikely to work that they never even considered outlawing it. However, I would expect there to very soon be a new rule preventing it in the future.

That's how crazy it is and how outside the box. They didn't think they needed a rule against it but now will almost certainly make one.

Maybe this is stupid or won't help, but imagine if Maradona's "hand of God" was actually legal at the time and just no one had thought to do it because of the integrity of the sport and everyone just knows you're not supposed to do that. However, he does it to score an incredibly important and iconic goal and it forces a rule to be made preventing it.

It's that sort of situation