All of the real meditation traditions around the world - including the ones inside of Christianity - spend decades training highly skilled teachers to help people 1) avoid problems like this, and 2) clean up problems like this when they do happen. And even so those traditions never, ever (in my experience) describe themselves as anything other than perilous. "The way is long and narrow." "Like a snake entering a bamb…
All long term buddhist retreats will essentially sit you down and try make sure you're mentally healthy enough and prepared to partake. People losing it during long bouts is a regular occurrence.
And our paradigm for safety is very different. People are less expendable.