Or perhaps soybean oil is a byproduct of the animal feed industry. It sure shows up in lot of products, yet people aren't typically running out to the stores buying bottles labeled as "soybean oil." I.e. it's a cheap industrial filler. Most likely, they are co-products that wouldn't likely exist without each other due to the economics. It should also be noted that soy cake is human-edible, so feeding it to animals represents that inefficiency I was talking about.
Given that less affluent societies consume less meat (on average) compared to more affluent societies, this demonstrates that meat requires more resources to produce. Otherwise this discrepancy would not exist. Developing nations consume more meat as they become more affluent.
Quality of education matters