Which wall are we b*tching about now? The one that separates the track from pit road, or the one that separates the pits from the garage area?
The outer wall is plenty high. Typically the same height as the wall on the oside of the track. The inner wall is high enough to protect the crews while being easy enough for the crews to jump over. All professional tracks in the US have a wall to separate pit road from the crew and the rest of the infield. I know for a fact that the one at Watkins Glen is high enough. Having stood behind it, stood on it, and sat on it I can say that I felt safe during a Grand Am (Motorola Cup at the time) race. Other tracks appear to have similar wall based on comparisons to what I have experience with.
Besides, the pit entrance at Indy is quite long. You have to slide for quite a while to end up amongst the pix boxes.
Heck, at Charlotte (which, IMO, is the more entertaining of the two US races this weekend), there is no wall to separate the track from the pits. Yes, cars have ended up wrecking on the front straight and hit pit road wall. But hey, we are supposed to be grown up, tough, men. Right? We can handle a little danger and take the proper steps to protect ourselves.
Perhaps Americans just handle the risks associated with racing a bit different than others around the world. Racing is dangerous for everyone (drivers, crew, fans, press, hotdog vendors, etc). You'd have to be a bit dense to not pay attention to what might be coming at you. Then again, stupid people inhabit every corner of the globe. lol
BTW, I won't be watching any racing this weekend. I have no TV and no interest in going out just to watch a race, LOL.