I feel like they (NHRA) wont park someone unless they witness multiple instances of serious safety issues. They might have before I started watching in the mid-late 00s but since I've followed the sport the only two guys I ever remember being parked for being a hazard was Terry Haddock in 2010 and a local guy named Gene Davis. Terry's deal was well known, got parked at the end of '09 for multiple oildowns and the spark plug shield incident. He then came out the following year and his first three passes blew it up and oiled the track from start to finish and he then had to make enough clean testing passes before being allowed to enter a national event. Gene Davis' deal was memorable because I had only been to a few races to that point but I remember at pre-season testing at Firebird they fired the car in the pits and even I could tell it was not sounding right. I distinctly remember a few more seasoned fans and a random crew guy from another team backing away very quickly. They came up later in the day to make a run and when they fired the car it sounded horrible again, made the burnout, a very weak one at that, and the starter shut them off immediately. Later on a buddy of mine before I knew him was a gopher on that team and he told me that it was super sketchy, they entered one national event, made one burnout attempt, blew it up and was told not to come back until the were ready.
Anyway I never get the feeling from Jim/Jon Dunn and those guys they are being unsafe, it could be as simple as a bad batch of parts like what happened with Force when he junked three bodies in three races. Or it could be a different "nitro event" each time like what happened to Tommy Johnson one year where they junked three bodies on three straight runs and it was a different mechanical failure each time. I hope they figure it out and I imagine Jim, Jon, Buddy and all those guys are going over everything with a fine-tooth comb and hopefully they have used up all their bad luck and get some good mojo their way. It was not all that long ago they were running solid 4.0s with the occasional 3 mixed in.