I'm not going to launch into the obvious. We know this guy could not possibly be screwed down tight. What is horrifying is that what drove him over the edge was her refusal to get out of bed and go shop for a car. I cannot think of anything scarier than telling my husband no, I'd rather sleep in (we have this chat a lot, actually) and my next realization is that he's pointing a gun at my head.
But no, people aren't more stressed or lashing out as they circle the drain. Nope. Carry on, citizens.