The unjustified demonization of corporations and industry is class warfare, which is an integral element of Marxism.
Breaking faith because “they deserve it” for raping employees, changing rules, or whatever else, is simple rationalization. It is wrong, and people know it is wrong.
"Demonization of corporations" because they are greedy robber barons is merely telling the truth.
"Demonization of corporations" because you are trying to sell socialism is totally dishonest.
Why? Because corporations are largely crappy organizations run by even crappier people but socialism and socialists are far worse. Humans are dishonest and unfaithful -- in corporations that is largely driven by simple greed and stupidity. But socialism is a different kind of evil: It is the desire to rule the world coupled with a self-righteousness that says they are entitled to it. One can walk away from a greedy, stupid corporation. Socialism kicks in your door in the middle of the night and you are never heard from again.
I won't steal from or defraud the company I work for because it is wrong. But I harbor no delusions that any promise or agreement they make will ever be followed through. I make my own decisions to do what I want to do and what I feel is necessary. Corporations are utterly faithless, you can't break faith with them because any faith that exists is only a delusion on your part.
More often than not, I find that I can do all the damage I want to do just by doing what they tell me to do, but even that I don't do out of spite or anger. I do it because it is in my best interest to do so because the corporation itself has made it so.