Hi, ATB.
Welcome. LA, wow, lucky you. Vegan paradise!
There were various responses to the quinoa article.
www.slate.com/articles/life/food/2013/01/quinoa_bad_for_bolivian_and_peruvian_farmers_ignore_the_media_hand_wringing.html
www.alterecofoods.com/blog/edouards-response-to-attacks-on-quinoa
Here are a couple of links, but just google 'response to quinoa article' and you will get more hits if you want to read more.
Soy is not a baddie, IMO, either. We don't have loads, because we believe in variety, but many of the negative articles are put out there by the meat and dairy industries, trying to discredit it and veganism. It's also worth noting that the dairy and meat industries use soya products to feed the animals, and consume more than people who consume soy directly do. Add on to that the devastating impact of the meat and dairy industries - their water usage, the faecal waste overwhelming the soil and water table, etc, and it is obvious that veganism is better for the planet, even if we choose to consume some soy.
I hope you can either give up the one cup of tea, convert to green tea to find a suitable substitute. Because veganism will make you feel good. Not just your health, but your soul. Once we know the truth about dairy, which you will learn once you watch more of those documentaries, it is hard to pretend we don't know.
Regarding exploitation in general, I feel that we do as least harm as we can. We have to eat. We have to get places, run the risk of treading on ants as we walk, or having flies end up splattered on our windscreen. I don't see how to realistically avoid these. Choose fair trade where you can. Don't waste. Be minimal. Don't over consume. People need to earn a living, be it growing and selling bananas, or grain, or sweetcorn - they need our money. Is this exploitation, or trade?