> do you think something structural or cultural has changed

Obviously it has? For one thing, we have billions more people on the planet. For another, we have far more constrained resources -- from the environment to education to everything else -- even for a constant number of people, never mind for the ever-increasing population size. (And there are more factors, but these are more than sufficient to get the point across.) These make competition more intense... in every aspect of life, for everyone. And it's only natural that more cutthroat competition results in more people breaking the norms and rules.

It would be shocking if this didn't happen. If there's a question at all, it's really around is when this occurs -- not if it does.