The sad truth is that people don't actually learn from the mistakes of others overall. Indeed, in some fields this is not quite so (e.g. if you see someone eaten by a shark in a pool, you will obviously refrain from swimming there), but in trading it is even worse than that. People do not only fail to learn from the mistakes of others, they don't even learn from their own mistakes, repeating the same mistake over and over again, which is pretty much bordering on insanity as Albert Einstein said ("doing the same thing over and over again and expecting different results")...

So before getting involved in trading for real, anyone should better find out if they can actually learn anything at all from their mistakes