In political rhetoric, should the word "cancer" be used to refer to someone who you believe to be evil?

Question

I know all about free speech.

Should it be used in polite company?

Or would it be considered too PC to refrain from using "cancer" in this way?

Answer 1

Cancer is pretty evil!

Answer 2

To me that would be a much more acceptable term than some other ones which are being used all too often.

Answer 3

Only if you're okay with me calling you a cancer.