Mothers shouldn't feel guilty.
It's just one of many parenting choices we make that effects health. Very few of us grow up in optimum circumstances for the best possible health.
Anyone who lives in a city for example, is there because of prioritising something over health. I live in a town that's polluted, for example. We stay here because we have jobs, good schools and friends - as do many others here. I don't think about it day-to-day, but I do know that it's a risk, that - bottom line, pollution is a killer as well as contributing towards ill health such as respiratory diseases. Everyone in a city or large town (probably most of us on this thread) are making similar choices - but parents are not made to feel guilty about it in the same way as mothers are for FF. Why? Well, because we're mothers living in a patriarchy, of course (IMO).
Also, the very fact it's mothers who are made to feel guilty isn't in, IMO. Breastfeeding shouldn't be framed as an individual choice of a woman, and it's her "fault" if she makes the wrong choice.
If a mother stops BFing, for example, why isn't a father asked "didn't you support her well enough?" and made to feel guilty for that? (I'm not suggesting that we should aim for more guilt! But just thinking - why doesn't that happen?)
Not so long ago, it would have been practically impossibly for a woman to get to adulthood without seeing other women around her BFing all the time, and to have picked up on lots of knowledge about the realities of BFing without even trying. Now, it's not unusual for a mother to have never seen a baby breastfed up close until she has her own.
We used to live in communities, near our mothers and other women who would have helped us BFing - often by sharing their own milk before that became taboo.
Now, women are expected to BF, having never had any experience of other women BFing, while isolated in their own homes, cut off from support, with partners who go back to work at 2 weeks, with "support" from HCPs who have themselves grown up in a FF culture and have had crap training on BFing. No wonder women struggle, and if they don't manage to BF, then they should not feel guilty, the cards are stacked against them.