Resist NOT Evil?? Why drugs exist?

I had never understood the first sentence, until I found the answer to the second one. I found it in one of my favourite ebooks: TFOC.

Drugs form part of the self-correcting design of the Universe and Nature. So, if there is someone how loves the feeling that drugs generate, this will contribute to his extinction.

Why is this related to the "Resist Not Evil" quote? because Universe and Nature were so well designed, that those evil individuals will force themselves to their own extinction!!!

If there is much fire, don't put more fire on it. Put something that can stop it, or leave it alone. Sooner or later, the fire will cease.