> In reality, it's everything but.
Well, if you have evidence of that then my interest would be piqued. But I must admit I suspect you're just being cynical. By far and away most of the ads I see are honest but with an agenda.
Manipulative is a debatable term. Advertisers are manipulating you in the same way I'm manipulating you right now - I have an opinion and I want you to agree with me. I don't really see how you can justify getting unhappy about that. It seems pretty reasonable given that they are ultimately funding whatever it is you are looking at at the time.
> catalogs, phone books, trade shows, and Internet search engines
Those are literally compendiums of ads, except search engines. But in this instance, the consumer is proactively searching for ads. Clearly the ad is providing some value to consumers. And the idea that consumers should attend trade shows to work out what their options are is patently absurd.
And working out exactly what search engines would look like if they were not ad supported is beyond me. I assume you'd be paying some sort of subscription free for the pleasure of basically googling ads. Seems a bit backwards.
> People can trivially...
No they can't, decisions about things outside a person't domain of expertise aren't as easy as you want to pretend they are. What the consumers really want is (a) cheap and (b) one of what everyone else has. Advertising isn't going to help with (a) but it is fantastically good at (b).
Figuring out what everyone else is doing is hard work. That is one of a couple of value-adding opportunities for an ad.