Quote: It's kind of like when my mother used to get up from the dinner table and scream about how she was going to kill herself. It was all talk - her way of venting her frustration.
Um, well, I'm not trying to judge your mother either, but it is possible you are tolerant of your W's actions in this respect because your mom did/said equally inappropriate things in front of you when you were a kid? NEITER of those things, your mother saying (and I assume it SOUNDED real at the time) that she was going to kill herself, nor your W wishing harm to you and your son are "normal" in the usual sense.
I know you know your sitch much more than us but realize that no matter how frank and honest your W is, a mother wishing harm to her child in ANY way is a little twisted to say the least. Sorry, that's just how I see it, and I don't think I could sweep that under the rug so easily.