Again I need to clarify that this happens to RHPers mostly, not us. Where they have a shitload of hangups, ignorance regarding basic things and trying to open chakras from base to top, e.t.c.
Those who are SS and under the guidance of Satan and the Gods and follow the methods on JoS, are themselves, they're pretty safe.
I have read similar things as well. I personally think the people that went insane from the raising of the kundalini were people who weren't dedicated to Father, or simply didn't empower themselves enough beforehand. As a child of Satan though, I would say not to be afraid of such things. And if you feel the serpent begin to raise and you feel like you aren't ready, then take a couple of days to dial back on your meditations until you figure out what areas you might need to empower still. Remember that we have protection that most people don't. We have knowledge that most people don't. If you ever feel unsure about anything you can always ask Father, or your guardian what steps you need to take next.
Also not being adequately prepared for kundalini can cause insanity. This means rushing, not taking time to clear spiritual, emotional and mental blockages and dealing with your subconscious issues as best as possible.
This is the true meaning behind purifying yourself before kundalini which has been perverted by the RHP teachings to mean being kind and loving to everyone and other similar horse manure.
It doesn't happen to us because we ensure we are informed and listen to our GD's and Satan. Were someone in this group to decide to ignore their GD and plunge forward without correct preparation, they are just as likely to run into trouble.
As Satanists we are given the gift of having teachers of this path who are second to none in the universe but as with anything if you don't regard what they tell you and do what you think is best despite their good advice then the benefit isn't a great deal more.