As a midwife, I've found reduced movements often causes conflict with the family of the pregnant woman. It's getting better, but it's still really slow to change.
I think there are a few factors, and bear in mind, I've found this with the female relatives of pregnant women as well as male partners.
I think there are a few things that go into it, firstly, other people can't feel what she feels. So the fact the baby isn't moving the same way rather than it has stopped moving doesn't seem to ring alarm bells in people outside the pregnancy. That even goes for maternity staff.
This is exacerbated in situations where someone has repeated trips to emergency assessment during pregnancy, but everything checks out fine or resolves each time.
Secondly, old wives tales about babies not moving much in the 3rd trimester are pervasive. This is where explaining the function of the placenta and how we monitor the wellbeing of babies often helps.
Thirdly, some people do realise what it could mean, but they're scared of that reality. Thus, they defensively avoid it. They get angry about it. I've seen this reaction about a few things.