The ethical issues of advertising were not really explored in much depth in that blog, however, so here is a brief overview of several problems that do put the ad industry in a grey light.
Evidently, the issue of ethics in advertising is of such social significance that there was a Pontifical Council on the subject. The Church document begins, like I tried to do, by noting that advertising (even political advertising!) can have economic, cultural and moral benefits. It can also do harm by misrepresentation, obstructing the democratic process, and corrupting a culture’s values by fostering excessive consumerism.