Hindsight analysis is 20/20, but, in my view, the FAs here were placed into an impossible "damned if you do/damned into if you don't" kind of nightmare scenario. Once the pax boarded and seated, and the situation had arisen, there were only two options: (1) leave the pax to his own devices; and, (2) assist. The former would likely have lead to a litany of potential problems ranging from the pax suing (no doubt if crew refused and something ill happened, they'd be blamed and many would say they should have done the compassionate thing, or whatever other virtue signaling term) and other passengers, who may be adversely affected, potentially seeking reparation. Or, the latter, assist, which is what they chose to do.
Classic case of lesser of two evils, I suppose.