Absolutely - totally agree that the calm, rational approach is likely better in most situations.. however in the immediate moments after someone has nearly ended my life in the name of their own convenience / stupidity I often struggle to keep a lid on my disgust.
I do lose it at times but you just end up in a shouting match, so being relatively calm gives you the upper hand. Sometimes they haven't a clue... I usually shout 'Oi' or 'stay there'. The village of Ladybarn, or 'sheetville' as I call it, is pretty bad for DGAF driving and pull outs by a certain set of drivers - no point in engaging at all.
I lost it once with some guy that leant on his horn - I was in stop start traffic, in primary, and my crime was being in front of him, like the rest of the queue. I may have flipped the bird, which then resulted in a heated argument and him threattening to run me over. I diffused it by shouting 'I've got your reg' - he panicked and shot off (I then got his reg as I was fibbing). I pedalled straight off to the police station nearby. The police took note, but couldn't find any CCTV. They did say it would go against the record, as the vehicle was known to them - so be very careful who you pick fights with, this guy was a known nutter.