Take your echo chamber info and believe whatever you want. But you're not an f'ing court of law. There's one place for this to be resolved, and that a court of law. Which requires an end to this run from the law.
It certainly appears that you have researched this case quite a lot, which is fine and interesting (I wonder what your motivations are for this). I just wanted to point out, however, that the comment you made above applies to you as well. You cannot judge the guilt of JA any more than the "echo chamber info" people, and should preface all of your comments in this regard with a disclaimer along the lines of, "this is my prejudiced and biased opinion". Having "researched the facts" does not mean that you have an objective, cool view. If anything, it seems you have the opposite. You are quite passionate about it, and thus likely ill-suited to judge the guilt or innocence of the defendant (using derogatory phrases like "Assange fans", etc. etc.).
Let's leave this to the judges and stop pretending we've already condemned Assange, alright?
If you RTFA, you will see that the point is not that after playing GTA you'll go out and kill someone. The point is that after playing violent games, a subtle shift in your attitudes will take place, a desensitization to violence and a growing attitude that it's OK to be violent towards others.
You may never actually kill anyone (and probably won't), but the effects of playing violent videogames will instead surface in how you address your loved ones, how you treat strangers who cross you the wrong way, how you deal with impatience towards others. You may not get the urge to pull a shotgun and blow their heads off, but you will undoubtedly have a greater tendency to belittle those who annoy you, to be verbally aggressive towards them, and yes, even to be physically aggressive.
It may take a lot of desensitization -- and indeed a lot of other factors too -- before someone who plays violent games would as a result go on a shooting spree, but that does not mean that playing violent games has no effect on one's psyche.
How many hardware guys does it take to change a light bulb? "Well the diagnostics say it's fine buddy, so it's a software problem."