Not knowing why those pilots got in trouble simply means that you are not a military pilot. If you were, you would understand, you would probably agree, and you might even wonder why the lead pilot did not spend any time in jail.
For the sake of education, I'll try to put it into perspective.
You've seen the little train that runs around inside many indoor malls? Imagine that the train runs on a course that has a rope barrier so people almost never walk on the train "track". Now imagine that some guy knows that this track almost never has anyone on it even during busy holiday shopping, so he takes a racing motorcycle down that indoor mall course surrounded by shoppers and children... at 200mph.
Now imagine someone taking 4 vehicles each weighing thousands of pounds carrying 2000+ lbs of jet fuel each, and doing the same thing at 500 mph.
Futher, imagine that the flight lead in this case had either personally read, or been briefed on, dozens of fatal accidents where someone doing the exact same thing crashed, killing at least the aircrew and in some cases killing dozens of people on the ground.
Now imagine that this pilot not only was trusted to carry weapons that could kill thousands of people, but was also training and setting the standard for entire generations of new military pilots.
What would you reasonably expect to happen?
There was no question that the pilot knew the rules, knew the consequences of breaking them, and knew of the fatal consequences that actually occurred when these exact rules had been broken in the past.
Maybe that will put it into perspective.