Police shouldn't be aware of the potential information from a perp, attorneys shouldn't be aware of opposing counsels' strategies, commanders in the field shouldn't recon and learn of enemy positions, and of course Intel officers shouldn't read anything they might disagree with....
I've read the idiotic Communist Manifesto yet remain an avid defender of freedom and am wholly against dictatorship in any and all forms, and read Darwin's Origins yet remain an avid "creationist," and more.
To opine that a "perspective" isn't "worth much" is to argue that information -- even opposing information -- isn't worth much.
Isn't it odd that we are discussing such as this on a forum by the marvelous name of Free Republic.
Promoting the causes of the far Left both home and abroad as good and virtuous is not what is generally done on a conservative, American forum. That's what this post does. That is not the same thing as what you are writing here...quit changing the context of the discussion.
The person who posted Haiphong's video did not post it as an example of communist thinking worthy of understanding in order to oppose it. They posted Haiphong and Escobar's video as an example of truthful information and a viewpoint that should be adopted.
There is a giant difference between posting the opposite side's material so it can be analyzed and posting that same material and encouraging the adoption of its ideas.