Green is for bad?

You know what’s ironic? How green often associated with bad and evil.

Think about it, the Wicked Witch of the West is green, so is the Hulk when he turns into the Hulk and even the Grinch is green. The Riddler in Batman- wears a green suit and mask. Poison Ivy in Batman? Green signature color. The gremlins in the movie Gremlins? Green. 

But then, the grass is green. Green lights mean go. Money is green. Green means Eco-Friendly. 

So which is it? Are they telling us that money is the root of al evil? Or that green means good.