

A quick internet search suggests 36 weeks (eight months), which is well into the third trimester, is the most common start of restrictions, and many airlines will accept a doctor’s note the woman is low risk even past that. It was a 2008 election blip when the media got ahold of Sarah Palin flying while in labor because she wanted her special-needs baby delivered by the medical team that had prepared for him, which suggests even the written restrictions in airline policy are not consistently enforced.
The politics aspect is much more driven by identity and social group than by sunk cost or refusal to have buyer’s remorse. A singular respected leader can turn the ship - churches and pastors were critical in the US civil rights movement, for example - but groups can be more nebulous without a particular leadership structure, like how difficult it is for people to leave Twitter: even though most users agree the experience has significantly degraded, there is no critical mass agreed on a replacement.
The more nebulous groups can break up - Twitter’s engagement is declining - it’s just slow. Maybe years or decades slow to get to the point it’s no longer one of the dominant social media. So I guess keeping the social connections open (giving someone who wants to make a major change an option to still have a friend or family member who will talk to them after), and patience.