I can't argue with you, that was dishonest and dumb on the police's part. They were undoubtedly doing CYA to avoid any family lawsuits after the man splatted himself, and the police shouldn't have tried to cover up the stun gun. They were probably in shock, they had tried to talk to the man for hours, did their best, and then he jumped. The police negotiator may be feeling bad now, but he shouldn't; some people you just can't help.
I agree. There are no guarantees of success--all you can do is try. Beating yourself up because something didn't work is not being fair to yourself. One victim is enough.