This is just my opinion, nothing more......
There will always be slow and fast riders on the track at any given event. Club days or National events. It's a fact of motorsport that all racers have to deal with. So are crashes. Most of the time crashes are the racers own fault, whether from a little too much courage or track conditions not being read ahead of time. Then there is the right hand controlling the brain syndrome which we all have been guilty of at one time or another. Agreed, most of the "bravery" came and went with our younger years.
It's got me beat how a National title can be held over a weekend. One bad start or a small mistake and that's it for your "title" chase. And I think this is where the risk taking comes from. A contender cannot afford to have 1 single mid pack finish within such a short race program without risking missing out on their dream. Some guys (and gals) work hard to make the dream happen and when a mistake happens, desperation and aggresive riding come into play. Hence the incident with rider #50 and #32. It was a racing incident that could happen on any track. It has happened to me when I attempted to pull off the track with my throttle jammed wide open. I put my leg out to indicate that I was getting off the track but the guy behind didn't see it. I didn't have time to raise my arm as I was trying to control the throttle and use the kill button. No biggie luckily. I went down and the other guy continued on. He came up to me in the pits to apologise and make sure I was ok. Then thanked me for giving him 2nd place......
Point is, I don't think anyone in VMX deliberately takes anyone out. Yes, things get a bit heated at the time but when it's all done and dusted, both parties usually understand that it wasn't intentional, shake hands and enjoy a coldie at the end of the day.
I believe there have been incidents at ride days like CD and BBB. Just goes to show that the "right hand controlling the brain syndrome" can happen anywhere.