If you're going to upset over a betta, you should be upset over 99% of the other pets people keep.
Read your whole post, it was very poignant, but this is the point I'd like to take out of it because most people will say tl;dr and just read the end.
Change starts with one thing.
And to be honest while I'd love for change to happen for all those animals I don't think most of them are cruel, especially for bonding animals like cats, dogs and some birds which can thrive in the company of humans. They're the good "companion" animals. And I'm not actively searching for change; I'm just a lazy guy on a computer who has too much other stuff to deal with than to campaign for betta fish lol.
But by making that thread I was hoping for a discussion which could at the least inspire some people who might have been oblivious to what was going on. I'm happy if I did just that, because you never know who you help and who might eventually help you in return.