...Probably you did not give much importance to the thought of the brahmins of the mid vedic period which was excerpted in my original reply...
Dear zebra16 (may I address you as narayan, I don't like zebra16),
I have no problem with Vedic Brahmins, I think they were honest about their beliefs and didn't try to obfuscate anything. There indeed was a push back against animal sacrifices, some of them wanted to replace real animals with animal figurines made of dough. I heard this in one of the Kalakshepams I attended and don't have the exact citation -- dear Shri Sangom if you are reading this please help me out. However, the conservatives won the day, figurines were not accepted.
In any case, whatever our speculations may be, whatever empathetic measures the mid-Vedic people adopted to minimize the pain of animal sacrifice, Brahmins turned to vegetarianism a long time ago, and they have been vegetarians for a long time like the other vegetarian NB groups such as Saiva Pillai and others. I have no quarrel with this. What I find unacceptable is this concept of Brahmin superiority a la Brahmin genetic disposition towards vegetarianism. In other words, I have no quarrel with Vedic Brahmins, my quarrel is only with those Brahmins who want to claim Brahmins are genetically inclined to be natural vegetarians.
Pivoting a little, I have no problem with Adi Shankara and Ramanuja, they presented a cogent argument based on their reverence to Sruti and Smrithi that taught them that Varna system is divinely ordained and sacrosanct. I even sort of understand the present day Brahmins who take the trouble to undergo the troubles of the Brahminical tradition in toto, taking all the hardships without complaint, though I don't agree with their ways. My problem is with the present day weekend and wannabe Brahmins who can't repudiate the words of Adi Shankara and Ramanuja who accepted the vile words of the Dharmashasthras and yet wish to show off that they reject Dharmashashthras. They can't have it both ways. Stand up for your Brahminical tradition and take the bumps, or drum up the courage to reject it. Those who want to straddle ஆத்துல ஒரு கால் சேத்துல ஒரு கால் are the ones I am challenging.
Narayan, the Vedic Brahmins were surely equally thoughtful as their counterparts elsewhere in the Greek and Egyptian world. But I think you have to admit that the present day Brahmins epitomized by the Jeeyars and Acharyas are no match to the cutting edge philosophical thinking by the likes of Peter singer.
So, my point is, take from Shruti and Smriti what makes sense for the present day world and don't let tribal consideration prevent you from throwing aboard what you can't openly admit to in mixed company.
best regards narayan ....
p.s. I am sorry I am not able to cite references from Shaknara or Sri Bhashyam for T.S. 2.2.10.2, I must have got mixed up. I am sorry. But I hope you will concede the overall point that T.S. 2.2.10.2. does refer to the Dharmashastra Manu and the revered acharyas cited Manu as authority for keeping Vedic knowledge, the only recognized knowledge at that time, from the "Shudras" and "Panchamas".