The following has been used for sure in order to commit crimes and fiddle with democracy: Verizon phone conversations, Gmail discussions, Twitter, Snapchat or Tiktok messages etc.
Nobody wakes up and says "let's be unethical today", but rather, it's the reality of life with user generated content platforms, that either you get both outcomes, or you get none.
The discussion is about making people realize that the "technology" to keep only the good parts (without the downsides) wasn't invented yet.
Hence we're in a position to argue whether it would be more ethical to shutdown / censor everything, or have fruitful discussions on how to emphasize the good outcomes over the bad ones with the current tech (by first understanding it, something that politicians seem to be very bad at, or show little interest in it compared to the negative FB sentiment engagement they're generating in their voters -- ironic :) ).