All this data says is that between 90% and 94% of people who are convinced not to jump did not go on to successfully commit suicide at a later date. It would be a big mistake to assume that whether or not you would come to regret your choice is 100% independent of whether or not you can be convinced not to jump and that therefore the fraction of people who came to regret commiting suicide is the same as the fraction who would have come to regret commiting suicide if they had failed their attempt.
"Apprehended" isn't synonymous with "convinced not to jump", but there does seem to be a sampling bias here, yes. (And can I say how refreshing it is to hear someone point that out and not be ignorantly insulted for it by dozens of people? Hyperlink to a "More Wrong" website omitted in the name of internet civility, but take my word for it that I'm describing an actual event.)
I think even "convinced not to jump" wouldn't necessarily change the decision calculus here, though. To the extent there is a selection bias...
Here's the new thread for posting quotes, with the usual rules: