brother, you have proven my point that people are attached to the Identity of being a "sikh" rather than actually practicing it. And brother, you are also wrong about SGGS not talking about such topics. Gurbani talks about lust, meat, etc many times:
“To take what rightfully belongs to another, is like a Muslim eating pork, or a Hindu eating beef. Our Guru, our Spiritual Guide, stands by us if we do not eat those carcasses. By mere talk, people do not earn Liberation. Salvation only comes from the practice of truth. By adding spices to forbidden foods, they are not made acceptable. O Nanak, from false talk, only falsehood is obtained”. (Guru Nanak Dev Ji, Guru Granth Sahib Ji, 141)
And this is just from SGGS. Also, not to mention the karmic effects of eating meat. A normal meat eater eats 7000 animals in his lifetime. IF you think this has no consequence you are stupid. Also not to mention the effect of meat and such food on your own mind, body and soul. How are you supposed to battle Kaam, Krodh, if you can't even control your tongue?
“Kabeer says, the dinner of beans and rice is excellent when flavored with salt. Who would cut throats to have meat with his bread?” (Guru Granth Sahib Ji, 1374)
I could go on brother.. Please think about this.
“Do not cause pain to any creature, Go back to your Home with honour.” (Sri Guru Granth Sahib, pg 322)