noone is impervious to bad trips... i had around 50 shroom, 10 mescaline and 2 acid trips (often these were combined with other drugs... mdma, ketamine, weed, alcohol), i experienced some unbelievably intense experiences, i'm talking ego loss, skipping back and forwards in time, intense loops, leaving this world altogether - the works.
all of these trips i considered 'good', i rarely felt paranoia, sometimes had physically uncomfortable experiences but i was NEVER the one to bug out.
however i believe there are good trips, uncomfortable or difficult experiences from which there is often something to gain, but rarely a full blown psychedelic meltdown occurs - far too many drugs are ingested and it just becomes a massive mess, a psychedelic soup, confusion of all the senses.
i experienced one of these and let me tell you - if you ever experience one for yourself you wont dismiss bad trips as 'a relic of the pre-psych myth'

theres no control whatsoever, and some seriously horrific shit can go down. you lose yourself, all your memories, everything just becomes a blur, pure terror and emotion, animal instincts - fight or flight. rebuilding yourself after such an experience is hit and miss, such trips can destroy people.
in short
my mind just seems to be perfect for taking psychedelics
dont be so arrogant.