And all three are necessary.
We all love to hate marketing. But the fact is that people make most decisions subconsciously. And not just buying decisions. Some say emotionally, but there's a whole host of other sub-concious factors influencing our decisions, such as habit and hunger. Marketing exists not because of scammers and liars trying to outdo each other, but because informing people about products by way of facts and figures such as feature lists doesn't work - because that's not how people make decisions most of the time.
For sure there are liars out there, such as the purveyors of skin creams. But most marketing is about invoking subconcious feelings about a product, not misleading about what the product is or does.
Thank you for the insightful point of view. Sorry you to see you got modded out for it.