Both Bus drivers are in need of training (I dont mean this in a sarcastic sense either)...it is possible that the first knew they had done wrong and the second "backed them up" simply as they both know that the penalty would be a dismissal.
this is no excuse, the bus driver showed appalling lack of skill & consideration for other road users.
you must report it for everyones sake, at best they will recieve better training, at worst they will loose their job. Either way, it was their choice to drive like that.
as far as the PCSO's s concerned, It sounds as if they did a pretty fair job. keep in mind they did not witness the event so can draw no conclusion, all they can try to do is ensure the situation does not inflame further (by stopping abuse/bad language
) which helps everyone.... and ensure that you are advised as to your rights..ie "do you want to report this/take it further"
at the end of the day, what else can they ..or even a proper-copper... do.
Please.... please... report this, the driver needs swift retraining