Don't eat anything you aren't willing to kill yourself. - Lorene Lavora
Eating bivalves were actually the thing that convinced me that I should start eating meat again. I had just finished reading Eating Animals* by Jonathan Safran Foer and realized that the dairy and egg industry are one of the worst offenders of animal cruelty and unsustainable farming. Going vegan was simply not an option for me. I weigh 10 pounds. If I went vegan, I would literally disappear - not to mention half (or more) of my diet would consist of grains.
It was around that time that I read this post about eating seafood sustainably on Whole 9. I realized that eating meat didn't have to be a binary decision. Now that I was educated about the agricultural industry, I couldn't just close my eyes and turn around. So I started asking questions and learning the source of where my food was coming from. Is it annoying sometimes? It's not ideal, but it's what works for me.
*If you haven't read Eating Animals, I highly recommend it. It's written more as a story about Foer's investigation into the agricultural industry than a fact based expose, but very informative none the less.