It can
Trauma, tragedy, depression, spontaneously with no reason, we are approuching times where kundalini
Become more common than in the past.
Although people need to be aware of engaging it, because it can cause mantal disorder especially in the upper chakras
I had top down kundalini and according to all information i had seen on web its more painful and dangerous
But mostly it take place without our will except spontaneous opening using drugs, fir sure that person will lamd in loony bin for a while