To be fair, I would also trust an attraction at Disney World, specifically Magic Kingdom of all parks, to not traumatize my child beyond a reasonable point. It was an issue with how much it conflicted with the larger Disney branding, which is traditionally very family-friendly, light-hearted, and usually with an air of adventure or whimsy. None of which would describe Alien Encounter at Magic Kingdom haha.
It maybe would've done a little better somewhere like DHS or Animal Kingdom (besides the sci-fi theming ofc), which generally lean edgier, older, and darker in tone with their attractions. Hence TTBaB, which fits better next to Kali, Everest, Dinosaur, poacher-plot Kilimanjaro, etc than it ever would in Adventureland next to Tiki Room, Magic Carpets, and Jungle Cruise. It's a scarier show, and imo it needs an older skewing park to help self-select an audience that could appreciate that.