Pace come on you surely know why. America is the most litigeous place on earth. One of their motor manufacturers got taken to court for not saying "you must not leave the drivers seat with cruise control engaged".
If the engine fails one thing is for certain - you will land. As we have discussed the chute is not there for every circumstance or for every two buck lawyer to run the argument that the outcome would have been different without the chute.
Bottom line is if the chute goes wrong someone will have a pop at the pilot for pulling it. The converse is how about having a pop at the pilot for not pulling it when the FL goes wrong. There are two options, neither offers a guaranteed outcome, neither can, because lady luck will always have a part to play.
Thats why it is for the pilot to decide and rightly so. If the chute provided a guarantee cirrus would say othwise, it doesnt and no one has said otherwise.