What word could be used to describe thee?

A thorn by any other name still hurts as much

You are my enemy

And you act as such

What metaphor can describe you?

You are the plague but worse

You are like cancer, and even too

Upon me you are a curse

Like a snake you strike

Killing your opposition

Putting their head on a pike

To show others their condition

But only I see 

The wolf in sheep's wool

You try to hide from me

But I am not a fool

I will not be your tool

To use in this game

I don't use others as a stool

You and I are not the same

You sickness

You heathen

Bane of my existence

My enemy