Elf, no one needs a believability gene to be affected by marketing. There are a number of posts on here which explain quite clearly the role that advertising plays, and how it is not necessary to believe ads for them to succeed.
I think you have been duped, to be honest. You think the ads are necessary to help mothers who feel bad about using formula - in fact, you go further, and say the removal of these adds would be a 'further slap in the face for them'.
That is so infantilising, and actually quite insulting to women who use formula and feel bad about it. What they want is good information to enable them to select a formula on health and nutrition grounds, not on cuteness or packaging or spurious health claims. They don't want cute ads, but the sort of help you had with breastfeeding with their next baby - you don't need to be on mumsnet for long to realise that many people are not as lucky as you are.
I guarentee, that if there was no unethical formula marketing, if it all just stopped, we would not miss it at all. Many things are not advertised, for all sorts of reasons, not always ethical, but economic.
Safety pins, for instance - I've never seen an ad for them. Do I miss them? No! Do I need to see ads to remind me that safety pins exist? No!
What about ads for formula that claim to support babies' immune systems? Will they make mothers who have chosen a formula that supports brain development feel guilty? What about organic formula? Does this make mothers who use non-organic stuff feel guilty? I don't know....I do know it is all unethical and contributes to undermining breastfeeding and is unhelpful to women who genuinely want to make an informed choice about which formula to use.
You don't need a believability gene to understand any of this, but you do need to open your eyes a bit.