When my kids were born I was kind of shocked at the level of pressure put on my wife to breastfeed. Advocates made formula feeding sound like borderline abuse.
There are many reasons why someone might choose formula feeding (and some reasons are better than others) but the last thing breastfeeding advocates should be doing is making new moms that are on an emotional rollercoaster to begin with, feel like they are a failure and bad mother if they can't or won't breastfeed.
To be more clear, specifically what I am talking about is that I know some women who have chosen not to try because they have heard it is very hard, and maybe some additional facts of its benefits (not just pressure from people that condescend) might have convinced them to try, or convince some women to do it longer. Everybody says it's good, we all know it's good. But nobody likes to do something just because someone else said it's good for them. They want to know why.