Not enough to get a folk tale, especially not a folk tale where Die Scherer is cutting off the thumbs of KIDS.
These tales didn’t make kids afraid to go outside, it made them aware that being outside had risks. Because that’s life, there are risks. Plenty of bad people pretend to be trying to help, “your mom sent me” is still one of the most popular lines kidnappers use. That’s why we STILL teach “stranger danger”, it’s just Disney that avoids it. We’re still teaching kids all the same lessons the fairy tales used to, we’re just not doing it with fairy tales anymore because Disney has taken those lessons out of them.
You know what also teaches “stranger danger”? Metal Gear Solid. Actually, it does even WORSE than that, it teaches that even a close friend of you may have a desire to backstab you. Raiders of the Lost Ark was already enough to leave me deathly terrified of God, serving him out of sheer terror rather than love, and the evening news reporting disaster and crime after disaster and crime left me too afraid of the world anyways. I already HAVE serious problems being in the outside world since I was a kid because of that, and I’m pretty sure non-Disney fairy tales would have done it as well (heck, when my dad attempted to read Harry Potter, I actually got so scared of it that I couldn’t even touch anything relating to it until sixth grade, and the reason I got scared was because of the infamous “magic word” scene in the second book where Uncle Vernon blew his lid off when Harry was trying to snarkily remind Dudley that he should say please.). You may think that may actually get kids to realize risks. I agree, but only in the sense that they’d realize the risks to such an extent that they’d be too afraid to go outside. I’d know because I WAS that kid.
And BTW, you should look at Marquis de Sade’s works, they probably would have been geared towards kids (after all, he did seek to corrupt people, especially the youth).