Umm - you should avoid getting information because it might influence you to buy things?UMMMMMMmmmmm - yes?
Obviously?
If you wouldn't let a salesperson barge into your house, interrupt your reading to try and convince you to get discount eye surgery, why would you let that happen in visual form?
in an ideal world ads would be just that - informing the customer about your product
This is not anything like an 'ideal' world. One human has such limited attention, that you could spend every second of your lifetime attending to a different product and do nothing else, and you still wouldn't cover them all. And companies still wouldn't be happy with this ridiculous limit case, they'd still want a greater share of your attention and wallet. You, us, individually, mean nothing except a source of coins.
If we want to mean anything to ourselves, defence against the dark arts is necessary.
The psychological marketing tricks to make a thing more attractive is also a value add.
The psychological marketing tricks to make a thing more attractive is abusive and parasitic. Ideal brains would search for what they need, and buy the most fitting thing. Human brains which can be manipulated are a weakness we all share - and we should all be kind enough not to abuse this fact of each other any more than we have to.