I think the general point of Sasha's post is that there seems to be the general acceptance that if someone acts inconsiderately to you, you should behave similarly back to them. So if someone cuts you up you should chase them down the road and have a go back.
sasha said:
just what exactly were you planning to do pullling up to them? give them an earful? oh well done, that would have modified their behaviour
Sasha appears to be asking, not unreasonably, 'what was the point in chasing this guy?'
OK in this case it was an armed robber in a getaway car, but if it was 'just' some oik in a car driving stupidly then catching them up and shouting might not modify their behavior, but in trying to catch them up one risks injuring others and having caught him up one might then find oneself getting hurt.
There is a difference between standing up for oneself and (if you like) standing up for the standards of society, and just having a go 'cause your pride has been dented.
I am not judging this case (who am I to judge) and I am very pleased that Marcos is OK. But I do think there is a fair and reasonable point behind Sasha's post.
Incidentally, unlike seemingly everyone else on this forum, this week I haven't had one brown trouser event, any damage to my car or suffered from anyone else's driving. I did nearly set my cap on fire whilst lighting my pipe this morning (lack of feeling through the gloves) but fortunately as I had my fog lights on everyone was able to avoid me as I paused briefly on the roundabout.