Was killing Vali from behind a righteous act by Rama

Sri Rama is a Kshathriya and it was righteous/Dharma to kill Vali.

Vali condemns Rama’s cowardly act by hitting him from behind, which, even Valmiki has not missed capturing in his great epic. But, what we should not forget is, Vali had taken away Sugriva’s wife and had treated him with devour, by sacking him away from the kingdom, seizing his kshathriya rights and many other stuff. A king needs to judge cautious giving importance to all the crucial evidence, which Sugriva tried to explain and despite that, he was mercilessly thrown away from the Kingdom snatching everything from him like a thief.

Is this a righteous act for a King? Who created this hypersensitivity situation?
Valmiki doesn’t say about the powers of Vali anywhere in his epic, it was elaborated in the later versions. It’s all attributed to great imagination!

A Kshathriya’s duty is to protect the person who sought the refuge from him and his sorrow was genuine, which was also similar as that of Rama’s when it came to the spouse’s kidnap. Sugriva gives Vali fair chances, through Rama’s guidance to accept his mistake and when he resists, a new game plan had to be framed, in which Rama promises to help Sugriva by killing Vali using his archery skills when they were involved in fighting and he does it only when Vali is in a verge of killing his brother during malla yuddha.

Hence, it was Rama’s duty to eliminate Vali whatsoever. Vali truly deserved this…
Honorable death does not embrace such kind of people, because what here needs to be kept in mind is that Rama’s duty was to protect Sugriva from being killed. Valmiki describes that Vali lifts Sugriva, who was tired and exhausted with one hand to crush his head to the nearby Stone, and lo there hits an arrow on his back. This is how he gets what he deserves. This invariably means that there is a tolerance limit and if bad still tries to barge through, then some things intervene overpowering it and that’s what happened in this case and nothing else.

So lesson is one would get back what he/she does for others. Therefore, it is essential to always do good and get good. If somebody gets bad even after doing good, then the bad giver definitely deserves what he/she would get!