But vali's wife tara says that he usurped rumi (sugriva's wife) and drove away sugriva and tried to kill him. So for these adharmic deeds he had to pay.
The issue is not brrahmins eating meat; they ate meat as yagna sesha and not for boga. Sacrificing animals in roughly two out of twenty yagnas is referred to by ramanujacharya and kanchi periyavar (in deivathin kural). That is a separate issue.
Killing of cow is nowhere permitted; even for yagnas. Do you have scriptural or puranic or any other evidence to show that cows were eaten and their hides were used for drums.
I am not as well versed as you in scriptures. I read this book. I am very sorry you asked a question like this, I am even more sorry that I started to research this topic.
For a vegetarian this thread has been very painful.
A. Historian DN Jha has written a book entitled "Holy Cow: Beef in the Indian Dietary Traditions" Jha has argued that the Rg Veda refers to the cooking of ox's flesh as offering
to the gods,especially Indra.Agni's food was the ox and the barren cow.This practice, acc. to him,continues up to 8th century AD in some form or other.But at the same time,there was tendency among Brahmins to discourage the practice of killing cows in Kalyug. Jha has also spoken
of the Manusmriti,which while providing a list of animals that could be eaten,forbade the eating of the cow
Acc. to Yajnvalkya Smriti ,a learned Brahmin should be welcomed with a big ox or goat,delicious food and sweet words.
Charaka Samhita, Sushruta Samhita and Astangahritaya of Vagbhata acc. to Jha,referred to the use of beef in case of specific illnesses.The book refers to Charaka prescribing a gruel prepared
with beef gravy, soured with pomegranates, as a remedy for intermittent fever.
http://sanghsamachar.wordpress.com/2007/05/11/the-myth-of-the-holy-cow-part-1/
"Several points emerge from our limited survey of the textual evidence, mostly drawn from Brahmanical sources drawn from the Rgveda onwards. In the first place, it is clear that the early Aryans, who migrated to India from outside, brought along with them certain cultural elements. After their migration into the Indian subcontinent pastoralism, nomadism and animal sacrifice remained characteristic features of their lives for several centuries until sedentary field agriculture became the mainstay of their livelihood. Animal sacrifices were very common, the most important of them being the famous asvamedha and rajasuya. These and several other major sacrifices involved the killing of animals including cattle, which constituted the chief form of the wealth of the early Aryans. Not surprisingly, they prayed for cattle and sacrificed them to propitiate their gods. The Vedic gods had no marked dietary preferences. Milk, butter, barley, oxen, goats and sheep were their usual food, though some of them seem to have had their special preferences. Indra had a special liking for bulls. Agni was not a tippler like Indra, but was fond of the flesh of horses, bulls and cows. The toothless Pusan, the guardian of the roads, ate mush as a Hobson’s choice. Soma was the name of an intoxicant but, equally important, of a god, and killing animals (including cattle) for him was basic to most of the Rgvedic yajnas. The Maruts and the asvins were also offered cows. The Vedas mention about 250 animals out of which at least 50 were deemed fit for sacrifice, by implication for divine as well as human consumption. The Taittiriya Brahmana categorically tells us: Verily the cow is food (atho annam vai gauh) and Yajnavalkya‘s insistence on eating the tender (amsala) flesh of the cow is well known. Although there is reason to believe that a brahmana’s cow may not have been killed, that is no index of its inherent sanctity in the Vedic period or even later."