What is right thought? Right thought is direct perception, deduction, and scriptural testimony–that is, the things you have experienced, the things that you can reason about and the ideas that have endured the test of time.
These all sound like good things–they are ways to try and see the world as it is, which is part of the fundamentals of yoga–so how could these be manifestations of the vrtti? This xkcd cartoon would seem to sum it up:
Being right can easily put us on a path of distraction, when we need not just to be right, but to be acknowledged as right; ultimately, when we decide to impose our will on the world around us. The more sophisticated our practice, the more we understand freedom in our bodies and in our hearts, the more we realize that we can never impose freedom, that we can only try to help others see how they are limiting themselves. They have to find their freedom themselves.