Well I dont really know about the integrity of the videos, and work must be done to find out what the truth really is. I personally feel that there was some sort of fixing involved but it has been blown out of proportion by the media.
One of my cousins knows Salman Butts family personally and he was telling me today, that they are one of the better off families in Pakistan. I dont mean they are enormously rich or something, but have more than average family with a stable background. He is just a newly elected captain, and why would one start fixing in his first month of captaincy? Pretty much all the previous players who were involved in match fixing where already established players first.
Regarding Aamir, the article from PakPassion a page or so back, stated what we all pretty much believed about him. He is just a small town boy who is here at the biggest stage only due to pure talent. Its also clear that this was his first such instance, his intenional no-balls were pure rookie stuff. He is just 18 too, and an un-educated 18 year old is not the same as a one you would find in one of the more well-educated societies. Plus it seems anyone who knows him to an extent, (Lawson, Ramiz etc) have come out defending him stating clearly that he was influenced, and he is not that match-fixer type. At this age, and with senior players who are not your ideal models surrounding you, one can tend to fall astray. Aamir probably knows that he is one of the next big things in world cricket, and easily has a bright future. Why would he want to jeopardise that?
Lawson stated (on cricinfo, I think) that one of the selectors were threatened that their daughter would be kidnapped if a certain player was not part of the team. One of the selectors at that time, Salahuddin Salu (I am not sure of the spelling) said today on an interview, that he heard that rumour too, and said it wasnt him as he doesnt have a daughter, but the other selectors with him did. I would like to mention there are rumours in the media, that the players may have been threatened to do this, as the people behind this are likely to be part of a mafia or a big gang. A big can of worms are being opened throughout this investigation and its more than likely, that we may never find anything concrete in this.
I am not saying that the three are innocent or should be let off, they are definetly involved to a degree, all I am saying its not as simple as being guilty or not. Theres more to it and before making the right judgement, we must look at both sides of the story and make sure the right punishment is given.