WARNING - Unpopular Opinion Alert!
Coming from a motorcycle background with some time spent in cars as well, I'm not sure exactly what everyone is talking about.
#1 safety issue is design of the vehicle. If the vehicle is difficult to control, there will be more crashes, more injuries, and more fatalities.
Safety equipment is akin to a parachute. A good rulebook with good design specs is akin to doing a good pre-flight, and keeping a honest logbook. Given the choice, I'd rather not have the plane fall apart to begin with than rely on jumping out of the damn thing.
I want late model trucks with all their factory safety equipment intact and older trucks retro'd to the same level BEFORE you discuss putting funny-car cages in street trucks.
Anything less is saying that late model racers need to be penalized for buying a safer vehicle to start with.
These guys are going turn these trucks up regardless. And if you ban them from the racetracks, they will race on the street and will kill both themselves and innocents for good measure. The "rollbar point" is where most folk ditch organized drag racing and take it to public highways instead.
I say stick with the existing safety guidelines outlined by the NHRA until there is sufficient data to indicate they are MORE dangerous to race (incidents AND injury) than gasoline powered "garage-built" race cars.
Drag racing continues to be one of the safest venues in motorsports. There is no need at this time to create a whole league of 700HP diesel street racers just so we can skip over control and braking problems.
Lets face it, no rollbar/cage/frame in the world is going to stop you from killing some spectators, crew, or the guy in the other lane. Like all my rides, #1 is control. I really don't want to die doing this, but I'd rather die than kill someone else.