It may also be the case that the author's first premise is wrong while their later is correct.

Perhaps targeted ads do work, and that's why they're bad for our society. You needn't even resort to politics to make this point. There are many things consumers might be persuaded into doing that are contrary to their own interests but profitable to corporations with large advertising budgets. Buying and drinking sugar water is a trivial example. In fact, that example makes clear the problem is with advertising in general, not merely targeted advertising. Targeted advertising is bad insofar as normal advertising is bad, and targeting advertising is worse insofar as it's more effective.