The Rig Vedic people are meat eaters and used to drink soma rus (alchohol) during the rituals. There are even rituals related to horse sacrifice.
You are wrong re: eating meat and soma rus. Were they eating meat for gratifying the tongue, or drinking alcohol to get high ? Such simple mistakes are common when following literal meaning.
Also refer to all the asava and arishta of ayurveda.
It is said that Vedas are knowledge from heavens or from cosmos, Rig vedic people composed all these revelations and formed what we call Rig Veda. Brahmins dominated Hindu society later.
Later when the society became Brahmanized they twisted the facts and some historical incidents, so that their domination will continue over the Hindu society. This was opposed by Jains and Buddists.
Some of the literature that were written during the so called Golden ages is rubbish.
You are right regarding corruption of some scriptures.
Problem is simple, in earlier times sons followed their fathers professions. So Caste system became hereditary. Even today with endless job opportunities in a globalized world, many Indians follow their family professions.
Also to others re: Caste system
The confusion occurs when you use, say Brahmin to refer to someone who is either: an enlightened being, a son of a Brahmin, or an "intellectual", or one who is a "priest". Can you equate these four ? I can't.
And what authority do you have to classify people ? Should others agree with you, for what ?
Now onto the biggest issue: in the entire Indian body of literature, caste elevation has only occurred a handful of times and that too with great difficulty involving years of penance and prayers. The scriptures which say that caste is to be based on profession, also say that elevation occurs rarely.
But what's so special about being an upper or lower caste ?
If its your actions that determine your caste system, then keep on doing what is right without really caring for tags.
Since no one caste or religion has monopoly over "enlightenment", "moksha" etc. And in todays' world no one caste or religion has monopoly over power, wealth, knowledge, lands etc.; caste system kinda sorta loses its relevance (at least the hereditary kind)
Rather than trying to reinvent something which is fundamentally broken, one should use it more constructively.
How to use it constructively ? If you want to follow caste system, see which caste you belong to and use those applicable injunctions for yourself.
Don't try to preach onto others. That's the reason caste system became dysfunction in the first place.
Be the change.
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Things are slowly moving towards the unification and equality off late in Hindu society though.
Mankind ought to move slowly towards unification and equality.