not especially dangerous as say a mountain lion
http://animals.nationalgeographic.co...-widow-spider/
They don't stalk us, they dont even like the same things we do.
That doesn't keep me from whacking them when I see them, I move my woodpile every year, and every year - there they are. The three idiots (my dogs) have never been bitten by one, and they live in the back yard and garage.
Diazinon does work well for them though, harder to find anymore now that the government has determined that diazinon once caused a squirrel to go nuts...