"Cambridge Analytica may have become the byword for a scandal, but it's not entirely clear that anyone knows exactly what that scandal is."

To try to prevent election manipulation using systems that profile people is difficult. It requires outthinking the people who are looking for clever ways to use the databases to achieve their goals.

Preventing it by prohibiting data collection and profiling would be more reliable. If a database does not exist, there is no clever way to use it to undermine society.