Re: To help or not to help
It all depends on whether you believe you're training in Budo or not. If Aikido is recreational exercise for you then I suppose you shouldn't. But if it means more to you then, your heart will decide.
I myself have stopped and intervened in 3-4 altercations and I chose to ignore 1. In the 2 cases that I intervened, it was the victim that was misconstrued as being the aggressor. It has so far all ended in a positive note, but I pray I do not encounter another one.