I'm not sure I'm doing Donald Casadonte any favors by posting small chunks of some lengthy emails he's written. Humor is one of those subjects everyone has an opinion on, and it's the nature of blogging (and particularly blog commenting) to give your opinion immediately upon reading something. When the something you've read is one seventh of a complete thought from someone who's been thinking about the matter systematically and rigorously for years, there's likely to be miscommunication.
In any case, Donald informs me:
If anyone wants to know about possible worlds and counterfactual logic, there are excellent articles by real "experts" at the Stanford Encyclopedia of Philosophy and not bad articles from Wikipedia.