If Michael had simply sad to the Schindlers that it was too much for him to handle and he wanted a divorce, they would have gone along with it and that would have been the end of it. Instead, he plotted to murder Terri in the cruelest fashion imaginable.
Michael Schiavo was offered a million dollars to hand Terri over to her parents and siblings. The question becomes IMO, who outbid that offer? Terri is deceased and the devil is in the details.