Comparing chiropractic neck adjustment to hanging

This is over the top but I need even more readers.
From Science-Based Medicine by Mark Crislip comes this quote.
I once calculated that the force of a neck crack is about 40% that of hanging by the neck and it has the same pathologic changes if it goes wrong. Every time I see a death in the movie where the neck is twisted to break it, I think chiropractic, although some tolerate it better than others.
Full post here:
Whack em hard/Whack em once and Stroke

This  is the paper that supposedly supports chiropractic.
Risk of Vertebrobasilar Stroke and Chiropractic Care
Results of a Population-Based Case-Control and Case-Crossover Study
Spine. 2008 Feb 15;33(4 Suppl):S176-83.
by Cassidy JD, Boyle E, Côté P, He Y, Hogg-Johnson S, Silver FL, Bondy SJ.
(5)
Dissected(pun intended) quite ably here;
Chiropractic and Stroke: Evaluation of One Paper

I will never have this done. Would you trust your chiropractor to not go over 40%?  Does your chiropractor even know about this limit?