It's great we can bring them down. What a terrifying experience to have a medical issue on the space station. Kidney stone? Ruptured appendix? intestinal blockage? How could you keep calm so far away!
Astronauts are of a breed apart. They're strapped onto a literally bomb which launches them into a vacuum, and windows where there is no chance of a mission abort. They've pretty much accepted a risk of death that most would simply not tolerate. Ex-military is common for astronauts for a reason.
whatever is the cause, it is not immediate - or they would've been on the ground couple days ago
so no, not appendix
I used to work in ISS mission control, this is not an emergency return but an early return
Also coming down on the Soyuz is pretty routine and only takes a few hours- I’d say it was overall a far less risky situation than being in Antarctic on a deep ocean vessel with appendicitis etc
We have dozens and (hundreds behind them) of men and women monitoring those folks from a global network of control centers 24 hrs a day- The station is mostly commanded from the ground and plans and procedures exist for everything
- if anything its all over orchestrated and over-planned in my opinion, owing to national politics, corporate contracts and international bureaucracy
Is it risky- yes obviously-but I’d argue its less risky then being out at the south pole in winter
See: https://nasawatch.com/iss-news/crew-medical-telecon-summary/
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How could you keep calm so far away
By going through a ten-year process that selects for calm people.