The only thing that would stop all this madness on our roads is by having many many more police on the streets handing out big fines to these selfish law breakers.
One thing that stands out for me from all these video's on road rage and from my own experience of driving or cycling is that there are lots of very unhappy people.
I agree Germany has a much better cycle network but still half of Germans feel unsafe cycling according to this
http://blog.zeit.de/fahrrad/2014/03/10/jeder-zweite-fuhlt-sich-auf-dem-rad-nicht-sicher/