Hare Krishna. What would be the most compelling argument against the poison conspiracy theory?
Krishna would never allow such a thing to happen to his pure devotee. Just as Prahlada Maharaja was fully protected, Srila Prabhupada was fully protected. We should not doubt the conclusions of the śāstras.
Dear Anonymous,
You fit the profile that is exposed in the book DECEPTION which provides over 500 pages of compelling arguments against the poison conspiracy. Perhaps you should get that book an pay particular attention to chapter 3 "The P-Con Bag of Tricks, Section 3, "The Deceptive Tactis Mastered by the PCON", Sub-section 7,"Mr. Unknown and his Cousin Anonymous.
Everything you need to know in order to understand that the Poison Conspiracy is a complete fraud is available at the following link. The question is are you willing to consider this material, or just avoid it like so many others heavily invested in this fraud choose to do.
http://jagannatha.com/library/deception-pcon-t-com/
If I can be of any further service in this regard let me know.
mayesvara dasa