Vruschikasyavisham Puccham Makshikaaya Visham Sira
Takshakasyavisham Dantam Sarvaangam Durjanasyacha
Scorpion’s poison is in its tail (so if you can manage to escape the sting, you are safe). Poison of insects are in its head and that of snake is in its teeth (therefore, perhaps, you can manage to escape the damage). As far as a bad person is concerned, everything about him is bad.
I think, human being is the only living being which can consciously strive to make life better for self and everyone around him yet become nasty enough to make life miserable for self and everyone around. The kind of ecological imbalance that the mankind has ended up with in the name of development, horrors like Hiroshima and Nagasakki, etc reminds me of just that negative potential