Bobby Moore wasn't a Sir. Seeing as Hurst and Charlton were knighted surely they could give Moore a posthumous knighthood?
I think the booing at the end, this is my take on it anyway, is directed at those not observing the silence rather than the slience itselt. It does tend to happen, those who keep quiet during the minute make their feelings known after it by booing those who didn't keep quiet, so really that can be taken as that. There are always going to be a large number of bellends in an England crowd who will make some nose during this type of tribute, they were probably Leeds fans.
Knighthoods end when the person dies, so it wouldn't make sense to give it posthumously. All you can do is regret them not getting it whilst alive.
Now this I agree with. They don't have any 'genuine reason' because there is no genuine reason. They are just knobheads. Not at all. I would have used Hillsborough, but I remember hearing about it on the news when I was six. It was actually one of the main reasons I found it difficult to go to matches when I was younger - my Mum was convinced the same thing would happen to me and wouldn't let me go with my mates until I was around 14.