Roughly half the people you'd see walking are "walking away from home". It's not a known risk factor. In fact unless they live near "nature" then being seen walking anywhere at all near their home is pretty reasonable evidence that their disappearance, whatever the cause, is less likely to be "Got lost hiking" or similar.

Okay but one of them literally got lost hiking. Two, if you count the cancer researcher that a lot of people online seem to be bundling in for some reason.