If anything at a theme park causes anyone stress, they might want to move on to other forms of entertainment.
Oh, I don't know. Rare, but:
1. Six Flags Texas: 2013- passenger flung from seat on the Giant, fell to 75 feet to her death.
2. Oakwood: 2004 - Passenger fell from her seat while riding a water roller coaster, died. rider operators failed to check restraints.
3. Slitterbahn Waterpark - decapitation
4. Daytona: 2018 - Sandblaster car derailed, 2 passenger were flung 34 feet, and 8 others injured
5. Six flags GA: 1984 - Haunted Mansion fair, attraction had no sprinkler or easy emergency exit, 8 people burned to death
6. Disneyland: 2003 - car came off the track, 1 person died, 10 injured.
7. Disneyland- boy trapped under a car
And these are just a few accidents that have happened. Members of my family have personally witnessed rather 3 serious accidents. The first two involved fatal attraction ride malfunctions that lead to fatalities. One was very many years ago, but it is the kind of thing you never forget.
The third was a time I witnessed a woman with an infant in a baby carrier take a nasty spill on the pavement in Epcot. I didn't see the actual fall, as I was too far away, just the immediate aftermath. Kudos to WDW, paramedics swooped in immediately. My interpretation was that she missed when stepping off a curb. Instead of bracing her own fall, she braced/protected her baby. It appeared she successfully protected the baby, but badly injured herself in the process.
Clearly that could have happened anywhere, but I still picture it every time we walk through that area, and that was 10 years ago.
I was also going to post another ride malfunction I read about where nobody was badly injured, but people were trapped nearly upside down on a coaster for hours before they could be rescued. I also happened to ride Splash the day before someone was killed on it.
I'm also forever wary of large bounce houses, especially outdoors. Not exactly an amusement ride, but they are notorious. A quick search and you'll find lots of photos.
I dunno, to me 'stress' = a traffic jam when I'm late. More or less, we regularly live with stress. I wouldn't go to theme park if I felt overly traumatized, but I also would never go to an amusement park without being aware of my surroundings either. I try to be cognizant of emergency exits, and take a moment to make sure my seatbelts appear properly latched. that level of awareness.
Sorry for the rant, I just think it is smart to be aware theme parks do pose a little bit of risk.