I have recently tried and failed to become a screenwriter, so yes, this rant is from a bitter person, but it is also true. Hollywood is a community run by cowards and liars who are overeducated for their intelligence level and overpaid for their job performance.
When I first moved there I thought that I had enough fresh and original ideas to sell a screenplay. I was not expecting fortune or fame. I expected to have to have another job to support myself. I wanted to be a screenwriter because I felt that I had important stories to tell that might make people think. I was soon to find out that the last thing anyone in Hollywood wants to do is make anybody think or produce anything by an unknown writer.