Well, it makes sense if you consider the following statements.
- "The stronger the enemy, the stronger we become.""When brought back to life from the brink of death, our battle prowess multiplies exponentially.""You Saiyajins are a warrior race at heart, yes? You love battle above all else!! The stronger the opponent, the greater the joy."
Now, let's take a look at Johnny.
- He was basically a glorfied shopping mall cop. Then along came terrorist veterans of the fiercest battlefields of 1980's Earth.
- He was absolutely shredded into a bloody mess by these bastards, barely coming out in one piece after each confrontation.
- And yet he not only (barely) survived, but DEFEATED all of them.
- "Glorified shopping mall cop"? He was an NYPD detective, and a Lieutenant at that.
- He was absolutely shredded into a bloody mess by these bastards, barely coming out in one piece after each confrontation.
- 3 years later, the hero of Nakatomi Towers is able to dispatch multiple veterans of the Persian Gulf War completely unscathed. It takes a master Martial Artist like Colonel Stuart to actually bring him down, and even then only barely.
- They weren't Gulf War veterans. Die Hard 2 was made two years after Die Hard and a full year before the Gulf War. Colonel Stuart, Major Grant and a few others are old enough to have served in Vietnam while Grant's platoon are explicitly veterans of Grenada.
- Another 3 years later: FIVE Veteran soldiers + Jonnny in an elevator = 5 Dead Veteran Soldiers and one PERFECTLY FINE Johnny.
- FIFTEEN years later? Kills a helicopter bristling with heavy-artillery by ramming a car into it.
Johnny faces progressively stronger opponents, gets shredded into pieces each time, somehow comes back alive and is stronger afterwards.
Just in time to face the next EVEN MORE powerful opponent.
And as his Saiyajin nature awakens by Die Harder the ONLY times he's shown to be happy is when he is in battle brutally killing enemies: He is otherwise bitter angry and morose ALL the time, like Vegeta or ANY Saiyajin who is deprived of a strong enemy to fight for extended periods of time.
- He also has saiyan blood since he ages slow (Saiyans have a prolonged youth because they are a warrior race only after all...or Vegeta said something like that) This is why he can still kicks some serious asses being 58 years old...sooo...is Rocky a Saiyan too??? (to be confirmed in "Rocky 7"!!!)
- FAIL!!! (I also bet on Patrick Stewart as one of the villains...so we are even XD)
- I think all of us were waiting for Stewart as a Russian Army General villain...damn, he would have really fit in that role...
- And you just know that, upon realizing what he'd done, Powell's only response was... "Did I do that?"
- Even if he didn't go to jail, the sheer number of lawsuits he'd have been buried under from airport patrons who got injured in the panic would leave him a paupered pariah for the rest of his life.
- Considering the situation from his side, there's a good chance he only broadcast because he believed he was going to die on the plane. To him, it's possible that the broadcast he was making was what he thought was going to be a Final Speech. It doesn't excuse what he did, but he clearly Didn't Think This Through because he believed he was going to die after that broadcast was made and didn't consider the possibility of surviving. He didn't want to die, as we see him after Holly tases him when he's escorted to his seat. Everyone on board the plane thought they weren't going to make it, though they had hope that they might get lucky. They were fortunate enough to survive because of John's dedication to getting his wife back alive and making sure the bad guys lost. Now that he's still alive, there's a good chance there's consequences Dick's going to have to deal with, one of them being the loss of his job in addition to the possibility of having jail time.
- Just ask Dr. Emmett Brown! Ah, the '80s.
He probably intended for a few of his subordinates to die during the heist thanks to police/FBI presence, and then he would double-cross the survivors after the fact, but once McClane entered the picture, Hans’ end goal suddenly became easier since he didn’t have to dirty his hands with the terrorists' deaths.
The lone exception to Hans’ double-cross is Theo, who’s notably the only one of the group with a specific skill necessary to get the money. Everyone else is essentially hired muscle, and as such disposable, and Hans would reward Theo’s usefulness by letting him escape with his share of the money. That’s why he jumps ship to prepare the getaway car as soon as he’s no longer needed by the vaults — he’s ensuring he makes it out alive.