and probably didn't even care if someone else could die if they stole it
They had no idea what they were stealing. Otherwise, they wouldn't have opened the cargo and given themselves a lethal dose of radiation poisoning.
And if they'd gotten involved in a high speed pursuit they could have killed someone just running away.
Guilty of crimes not even committed. Gotcha.
Not to mention their willingness to threaten deadly force in the act
They beat up the drivers, not shot them.
They jacked a rig, had no concern for the value of human life, and it bit them in the ass. To be blunt, they had it coming.
To be blunt, you're a bloodthirsty authoritarian thinking with his lizard brain. No, people who commit assault and grand theft cargo do not deserve to die. You wouldn't be from Texas by any chance, would you?