Sometimes the way the woops are made at some tracks is just asking for crashes. Triples or doubles don't mean much, either can hurt you if there's not enough room to get set, or it's too long for conditions. bad landing area, etc.
It's up to riders to say "This is a dangerous track, and we're not riding it", but how often does that happen?
Example: two years ago we went to a fairground race where several riders thought the setup was plain dangerous and stupid. The promoter and designers had highway concrete dividers right next to the track, with just enough room for someone to walk between the dirt and the dividers. Some of the turns and one jump landing had telephone poles the riders had to go around, "safely" covered with (drum roll please) one bale of hay each.
Here's where the problem arose: the objecting riders went around asking for support, and even though almost everyone agreed there were some serious safety issues, they wanted to race anyway. Hey, if some of us dropped out, better yet! less competition if we were afraid to ride this one!
There wasn't enough supprt for a boycott, and my son decided to ride anyway, I stayed out of it. The 125B practice started and on the first lap, at the ramp for the double, one of the riders changed his mind and his line, forcing my son off the side of the jump, right onto (yep, you guessed it) the top of the concrete dividers from a 15 foot height. Thankfully he was just very badly bruised, nothing broken. Later two riders plastered themselves on one of the telephone poles (protected by that wonderful bale of hay) when they collided on the double's landing.
Some tracks are safe only when NOBODY makes a mistake, and being human, fat chance of that, we won't even discuss mechanical failure.
So the gist is this, some track designs offer too much of a chance for riders to get injured or killed, but until the riders say"no more of this", it doesn't mean a hill of beans.