Learn English – How to describe a person who does not get to the point

A defeatist expects to fail, and therefor, either does not try at all or tries in a half-hearted manner.

You're describing someone who is envious.

envy a feeling of discontent or covetousness with regard to another's advantages, success, possessions, etc.

Some see this as the same as being jealous.

jealous resentment against a rival, a person enjoying success or advantage, etc., or against another's success or advantage itself.

However, a distinction can be made between them as envy is about a loss of equality while jealousy is typically about fear of a possession being lost. http://www.vocabulary.com/articles/chooseyourwords/envy-jealousy/

EDIT:

Thanks for the edit. Knowing this is for a logline helps a great deal.

I'm not finding a better single word for you but do have a suggestion for useage.

Say your antagonist's name is Dr. Conners. Your logline might be:

Dr. Conners envious demand for equality with the rest of mankind leads him to force his own misfortunes upon others.

This may need tweaking for your own use. Your line about arm chopping has me thinking about old spiderman comics. And for some reason, communism.