As a former intelligence agent I'll address the first one: Anderton's access. I was read off on my top secret clearance in 11/99...but my access to the SCIF I worked in had still not be revoked by the time I had left service. How do I know? I keyed in to talk to one of my co-workers 2 days afterward.
People get distracted; especially when chasing your boss. It probably never occured to anyone, 'cause they were too busy chasing him. Trust me on this one, it's not as unlikely as you think for a bureaucracy to miss obvious stuff...like a bunch of Mulsims trying to learn to fly but not land.
1. There were two reports. There was no minority report; it was mistaken for a minority reort, for an echo.
2. The other 11 cases? They were pardoned afterward, with everyone else.
3. Good question. I was wondering if they were making more precogs.
4. The explanation seems to be, he had pre-meditated killing the person who did it. This was the one weak point in the deal. As for seeing von Sydow's part -- they only see murders. That's why they don't see other crimes. It was the metaphyscial disturbances of murder that caught the precogs attention.
5. Bad press. Also, I think the Danny W character showed the concern that some had on arresting someone for a crime they hadn't yet prevented. The whole idea, in a nutshell, has serious ethical problems.
Just my take on it.
"War is an ugly thing but not the ugliest of things; the decayed and degraded state of moral and patriotic feelings which thinks that nothing is worth war is much worse. A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself."
John Stuart Mill