-…the lucky individual who got to witness these events he/she still did not write them down immediately which again would dis condone the reliability of their experience.
The first statement is accurate – the men who witnessed these events did not write them down immediately. They had no idea what they were witnessing, as to its impact on their lives or the world. But Jesus promised them that everything that they needed would be “brought to their remembrance”. An example of this promise is …
John 14:26 But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
As for mass hallucinations it is possible that water supplies could have been tainted or food supplies spoiled with certain mycilium who knows?
One of the problems with this reasoning is that there is no reported mass hallucinations of the general public during this period, and your suggestion implies that the disciples intentionally ingested the hallucinogenic. If so, the force of your argument seems to evaporate.