Mountain lions are some of the most beautiful things on earth. There have been "sightings" south of Dallas along Ten Mile Creek, which runs by my house. I have my doubts but our animal control officers say it's so. I've only seen bobcats around here, which are also wonderful things. I don't see the lions as a problem...in fact, consider yourself blessed if you EVER get to see one in the wild. They move like ghosts.
Hiking Big Bend for 30 years yielded one distant sighting, with over two dozen in the park now. As long as there is natural prey around, deer etc., there should be no threat to humans. Small children and slow pets might be a target someday if a lion becomes habituated to city life. There have been 'attacks' of children and adults in Big Bend, with no deaths or serious injuries of which I'm aware. It was more like "human surprised and startled big cat" if one reads the reports.
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paul, texas KD5IVP