Now, as for dangerous rides...
There's an indoor coaster at King's Dominion called "The Outer Limits" - at least that's what it was called the last time I was there. No real "Outer Limits" branding, it's more space-themed. Again, it's a totally indoor coaster - like Disney's Space Mountain. It's being in the dark that makes it seem more "dangerous" and faster than it really is since you can't see where the tracks are going.
When the ride first opened, there were lots of reports of the test dummies coming out of the ride headless! Needless to say, they had to make some adjustments to the ride before opening to the public. And when it finally opened to the public, the lines were as long as ever. It still was a bit of a rough ride, but it was fun. However, after the first season, they modified the design of the seat. They removed the head cushions that were on the side of the seats. Apparently, NOT hitting the sides of your head on the "cushions" was a lot safer than hitting them.
Hmmm...
As for "Mission: Space" - or any of those simulation rides ("Star Wars", "Body Wars", etc.)... My experience has been that there are enough disclaimers and warnings for potential riders posted along the way. And they provide ample opportunities to leave the line and the ride. However, there's so much "peer pressure" from the people your with, the rest of the people in line - especially the little kids... And the people coming off the ride with huge smiles on their faces. And sometimes looking at some of the people with uneasy faces can be an incentive, encouragement to get on the ride.
But, ultimately, you won't know just how the ride will affect you until you ride it.
As for the recent tragic event at Disneyworld... I just always wonder at the wisdom and judgement of any parent - and Park - letting anyone under the age of 8, 10, 12... on any sort of ride like that. -And I've always wondered just how many ages, sizes, heights, etc., they test for in the first place.
*And I've seen more than one instance where I've seen a parent drag a truly reluctant and scared child onto a ride... And then have to deal with the still scared and now sick child afterwards.
For myself, I can't do those types of rides anymore. My tolerance for being purposely made dizzy and nauseous has dropped over the years. Thrills - hills, loops, speed, etc, - I can take. Feeling like I'm in an out of control, speeding vehicle, while watching the visual simulation of said "trip", I can't.