He doesn't hand forge those batarangs. They are just metal covered bats. This is why they fly so well. He also kills a thousand bats every time his cape gets ripped so he can replace it. And he's forced all the bats out of thier natural cave-home so he can have a secret lab. For testing his knockout gas on the captured bats. And Alfred butchers the animals for Bruce's meals with a rusty cleaver.
The Joker is really just a reasonable animal care director.
Next, Spiderman. He clearly just molests spiders to gain their powers for his own selfish ends.