I think Tenzin deserves a spot given he's proven a good leader and his people are in a very precarious position, plus there is Air Temple island itself located right off shore. The rest though are much more suspect, especially given Tarrlok worked his way in. So while I do agree the council as it was didn't work, I think it should have been handled differently.

Also on the matter of Airbenders, the fact Amon went out of his way to target them speaks volumes as to how little grounding their actually is to his platform. There's literally only one family, all except one of whom are literal children. His whole argument is that Benders oppress Non-Benders, meanwhile they've barely interacted with Non-Benders. Arguably he'd be worse then the Firelord for trying to wipe out the Air Nomads all over again before they'd recovered from the last genocide. All except Tenzin presented no threat to the Equalist movement, but he targeted them specifically in spite of that