@oralloy,
The problem here is how the word 'justifiably' is interpreted. Same as 'reasonable force'.
What I want to know is how situations escalate so rapidly and then spiral out of 'normal' control.
Does no one believe in discussing issues any more? Let's sit down and work this out? Is being cut off in traffic worth a prison sentence? They cut you off, you kill them, they're now dead, and you're looking at life. Is this reasonable? Of course not. It's absolutely insane.
Some Americans are completely out of control. It's evident in the daily papers and news channels. And no, you're not the only country to experience this, but do you not see a downward trajectory in your own country?
It's extremely sad and dispiriting. You might have the right to bear arms, but I'm pretty sure it wasn't intended to shoot a driver who pissed you off.