Many adverts do more than just advertising products. Some try to make people feel inferior if they don't have the product, or if they have something which the product would change. Perceptions of beauty and fashion in particular have been terribly distorted. Many young people have low-self esteem, and lead unhealthy lifestyles because they feel they should be thinner and more attractive like the models they see in adverts. This leads to serious problems like eating-disorders and self-harm.
The media and celebrity magazines do much more harm, by mocking unattractive or overweight people, and glorifying models who are often dangerously thin. Adverts never criticise people - that would be terrible for the companies behind them. Their aim is to understand and provide what people want, and so their adverts only ever reflect what people think. If people's perceptions are wrong, then it not the advertisers' job to put them right, but politicians, the media and schools.