I don't think its fair to say that the only reason the coalition of the willing is formed is out of fear. The more questionable members have entirely seperate motivations.
Jowy/Dantski have an obvious gain. They remove a dangerous neighbour who would have eventually deigned to stop teching up and kill them. Pure survival.
Kathlete goes from no 2. to no 1. and uses only leftover military units. Its all working out for them.
Whosit gets in good with Kathlete and Jowy for a later partition of the Inca and place in a tech aiding alliance. This is possibly the most questionable involvement as it really has hurt his economy to sustain all those military, build all those galleys and blunt their massive military in an attack that doesn't help them much. His attack is clearly for diplomatic reasons rather than gameplay and stems from the doctrine of mutual aid alliances that he has been talking about since he joined.
Nakor joined in order to build up good relations, particularly with Whosit. By helping to convince Whosit to commit their forces in India it means that they gain greater security. He hasn't really committed a big military force. Just enough to show effort.
Jowy/Dantski have an obvious gain. They remove a dangerous neighbour who would have eventually deigned to stop teching up and kill them. Pure survival.
Kathlete goes from no 2. to no 1. and uses only leftover military units. Its all working out for them.
Whosit gets in good with Kathlete and Jowy for a later partition of the Inca and place in a tech aiding alliance. This is possibly the most questionable involvement as it really has hurt his economy to sustain all those military, build all those galleys and blunt their massive military in an attack that doesn't help them much. His attack is clearly for diplomatic reasons rather than gameplay and stems from the doctrine of mutual aid alliances that he has been talking about since he joined.
Nakor joined in order to build up good relations, particularly with Whosit. By helping to convince Whosit to commit their forces in India it means that they gain greater security. He hasn't really committed a big military force. Just enough to show effort.