What should we think about the future, where nobody is making the decision to target teens' with specific emotional state, but instead the machine makes the dec

What should we think about the future, where nobody is making the decision to target teens' with specific emotional state, but instead the machine makes the decision? I see this as inevitable - probably something that is already happening to some extend. Let's assume you are advertising something where the target action takes place online. Something where you can establish a direct connection between the events "Person A sees ad" and "Person A buys product". Assuming the volumes are high enough, why would you put human in charge for targeting the ads? Why not just put the machines to work, to analyse the thousands weak signals your platform is collecting about each individual and then determine which ads are most likely to result in purchase. If the sale takes place through your own platform you have pretty nice feedback loop there. The machine of course does not think "hey, this person is depressed, let's sell him some Happy Pills" but the end result is likely the same. Machine learns some patterns in behavior which indicate the person is likely to be interested in Happy Pills. Is this good or bad?