I've pulled the Fool quite a lot in relation to my little cat. She's almost six months old and waaay more adventurous and curious than I'm comfortable with. More so than any cat I've owned -- and I've heard too many stories from people of their cats and injuries due to curiosity. The Fool card prompts me to watch her like a hawk, for her own safety.
I suppose it could very well have to do with suicide, but I think I'd tend to look at it as an incident that might've been a half-hearted attempt (which can be just as dangerous as a serious, well thought out attempt), and that it can indeed result from depression.
Some people tend to be more careless or have an attitude of "who cares" when they're down, so it's possible there's a kind of blurred line between accident and impulsive suicide attempts that could be a very real concern and relate to the Fool. I would see the Fool, if it relates to suicide, as a more impulsive than well thought out one.
Nevada