From the article:
> To be honest, I always assume good faith from people who offer me to sign some documents
Sure. And most people asking you to sign documents are doing so in good faith. But the contents of the documents themselves overwhelmingly bias toward the interests of the organization who wrote the contract.
Additionally, while the party asking you to sign may be doing it in good faith, they may not be the ones who end up pursuing enforcement. A contract should be evaluated based on its contents and never based on your trust of the individuals you are negotiating with.