Okay, so you train your classifier on extortion. Then you train it to detect sexual content. Then you train it to detect potential piracy. Then you train it to detect wrongthink. Then you don't have a free society anymore.
There are many other cases in which we allow limited intrusions into individual freedom in order to protect society. For instance, here in the UK, a police officer can enter my house without a warrant if they believe that it is necessary to facilitate an arrest for an indictable offence -- and that has been the case since at least 1984. If your way of thinking was accurate, police should now be routinely entering my house and beating confessions out of me.
Casual piracy, e.g. link sharing in DMs, would be a tipping point if I had to guess.
Truth and lie are written the same.
ML is useful because it can continue functioning with ambiguous data. Even so, it can't remove it or resolve it.