The way I see this is that if we were to take this out of the baby feeding context and try a less emotive analogy the the points made by Tiktoc and others might seem bleedin' obvious.
Ok, so imagine, if you will for a minute, that there is a product for adults that needs to be re-hydrated, some sort of breakfast cereal say. People in the west use this product all the time. They have access to clean water to add to it, and the wherewithall to heat that water to the required temperature to ensure the product is safely made into a breakfast. There are rarely any problems with food poisoning, diarrhoea, etc in using the product this way.
The company that makes this product has also marketed it to developing countries. In these countries people are not able to make the product up safely as the water they use is contaminated and they often don't have enough fuel to boil the water. Lots of people die as a result of this.
Oxfam is involved in trying to protect vulnerable populations from misuse of this product.
So along comes Mel B to participate in an Oxfam film about poverty. She decides to write her name on a dehydrated cereal box as, to her, this item represents food. She successfully uses this product at home without inadvertently poisoning her loved ones.
Clued up Oxfam chappie says; "hang on a minute, Mel love, you can't do that. That box might represent 'food' to you, but in the poverty stricken areas this film is about it represents 'death'"
Mel says;"Wow, I didn't know that, thanks for the heads up, thank god I didn't write on the box as that would have been really crass, distasteful, ignorant, inappropriate and undermining to Oxfam's principles."
Or do you think she said; "Whatever, I'm going to do it anyway cos that box represents food to ME and people like me. People in poverty probably won't see this thing anyway so it's not like it matters how offensive it is to them."
It does matter because of principles, symbols, respect, understanding for others and being vigilant of airing undermining insidious messages which are made powerful through repitition no matter how short they might be.