RAMA’S STRATEGY

Often a  question is asked as to why Rama killed Vali  in hiding?  If Rama was powerful he should have openly challenged Vali .
People also interpret that maybe Vali was more powerful since Vali also had  the benediction of getting  half the strength of the opponent.
The experts of Ramayana give us a very practical and profound answer in regards to Sri Rama’s strategy, here it goes:

Vali was arrogant, insensitive and punished his opponent and subjects  more than required.
For him no opinion was valuable unless it came from himself.  He was powerful, but  this did not matter to the  people of Kiskinda .
They preferred a change of King, in the form of Sugriva.  Attacking  the entire country for bringing about this change  would  cause massive blood-shed . Hence Rama thought it would be  better  to kill him alone, without giving much information and  scope for speculation of  Lord Rama’s attack on Kishikinda.

But why hide?

Rama knew very well that, Vali was bad, but  he was not  a demon like Ravana.
Vali had some religious sentiments. If Rama would declare his identity openly, Vali would politically surrender but not from his heart, and would say, ‘I can easily bring Sita back from Ravana.”  In fact this is what he said, as he lay down  hit by the powerful arrow of Lord Rama.  He said “ why did  you not ask me about your Sita, I could have  easily done this task.” Lord Rama did not want to take help from a person who had committed similar crimes as Ravana. Vali had abducted the wife of  Sugriva, by force. So taking help form him would mean  supporting one person for the  very crime  for which he wanted to punish another.
So Vali needed to be punished, and that had to be done in a way where Vali had no chance of using any strategy. Lord Rama had to checkmate.

Thirdly, Rama did not  want to enter Vali’s kindom,  thereby giving no iota of speculation to the people of Kishkinda about Rama trying to  remote control the kingdom. He allowed Sugriva  to take compete control over the kingdom, and Sugriva asserted his authority over Kishikinda not as a representative of  Rama, rather as the king chosen from amongst their own people. Although personally Rama had became Sugriva s worship able deity.

Rama as a last stroke of strategy, assured the protection of Tara, Vali’s wife, by by asking her to marry Sugriva  as per the custom of  Kishikinda.
The custom was different from Ayodhya but Rama did not superimpose his rules in another kingdom, and at the same time Vali’s son was made into prince .

Even if we consider that  it was injustice to Vali, but collectively if we see it was everybody’s gain.
Most importantly a  good and sensitive leader would lead Kishikinda who was guided by a selfless intelligent, powerful  innocent, heroic  and devotional,  adviser, like Hanumana.