As far as I could read, it did not say 100% of women who don't breastfeed will die. It's information; only you can choose how to react to it and what you get out of it.
Well we are all going to die one day whether we breastfeed or not

Trillian - well said

And besides, what about those women who don't have babies so don't breastfeed, are their risks of stroke/heart attack increased too? Sooo many more variables to consider than what the study covers.