@HundredMilesAnHour
One of the issues with breast screening is that it's not about preventing cancer.
I'm sorry for your losses.
Your mum died. Despite all the treatment, she died. Some women don't want to spend their final years "fighting cancer" with all the side effects that entails, if they're going to die young anyways. What if you'd lost your mum sooner, but with less time in and out with treatment and the complications of treatment? That's a valid choice some women and their families make.
Some people do want to "fight cancer" however small or unlikely to kill them.
Very few women are strong enough that when they're told they have cancer, they don't bow to the pressure and decide to wait and see what happens. These could be cancers that would never harm, yet they're pushed into treatment by emotions.
Some women want screening. Some weigh it up and don't.
There's no point getting emotionally wrought about other women's risk/benefit analysis.
Screening is almost never clear cut at an individual level. It's a choice. It's offered to populations, because for populations a committee has decided the benefits outweigh the risks, at that population level. Individual risk is completely different, and personal. For some women, mammograms are intolerable. Others see them as minor. Everyone is an individual, and should be allowed to weigh up pros and cons without being shamed, or told that if they decide against screening they don't deserve treatment- the latter is particularly out of order.