You are probably right.

The core things I care about isn't direct honesty. I want to see how the difference in judging eating animals translates into rating of how much animals the person eats. That means I need a big scale where a lot of people can answer that eating animals isn't ideal but not that big of a deal. I also don't know that anyone argues that humans have a moral obligation to eat animals.

On the other hand in the case of rerouting trolley cars a two sided scale seems important.