***ETA: The dad used a Spyderco Cali. Pics of the bloody knife at the link.
A six year old boy was physically pulled out of his mothers arms by a mountain lion at a National Park. The boy's dad attacked the cat - who had his son's face in its mouth - with his pocket knife and drove the animal off. The kid is fine.
When outdoors, you're still at the mercy of mother nature, so act like there's a good reason humans are the dominant species on the planet. What puts us at the top are handy things called tools: knives are tools, and are great to have around because of their utility, and because they can be used as weapons in rare occasions like when some starving beast grabs your kid by the face. I'm going to put this out there: having a knife on you does not mean you're a sociopath waiting for the chance to massacre a tanning salon full of meek people. Neither does carrying a firearm. In fact, I'd say that carrying a gun further removes us from our alleged neanderthal roots. What did they carry to protect their gift of life? A stone club and a rape whistle made of bone?
People go out into the world entirely unprepared to deal with problems that have existed since this world was created. Right outside my door are woods chock full of hungry critters, and it's not a good idea to go there without the means to keep them at bay. Fortunately, the dad that saved the day had a simple knife on him, but in many parts of this world even a knife is unlawful to carry. I hope people wake up and realize that it's not the tool, but the man, that has the capacity to be evil, and evil people are way more rare than good people. It is a dishonor to bar people from carrying the tools that will prevent them or their family from being eaten by savage creatures.