This. We have them around here. Just north of the motor speedway. They run the creeks and small patches of woods that are in the area. I have seen them meandering through the area at mid day.Good friend of mine lives about five minutes up the road from us, back yard butts up to a small wooded property. She has two adult Rottweilers and the yotes would come up and run the fence line trying to tempt them out of the yard. They would take a domesticated dog down as a pack if its too big for one yote to dispatch alone.
Her husband was out with their dogs and saw this happen, he ran at the fence with a stick, the yote bared it teeth and growled before running off. That was the first and only time that happened. Steps were taken, problem was addressed. If you only see one, trust that there are many. Plan accordingly...
People they are everywhere and no they are not a healthy part of the eco system when they wipe out all the food sources and over populate as they have done in a couple of areas I know. My friends kill every one they see from the stands in season and hunt them as they can to attempt to keep them at bay. The reproduce like a virous.