Most nonvegans cannot relate to animals. This is why drawing comparisons to the holocaust, slavery and other past event in human history is necessary. It enables people to make the connection
Otherwise, they think things like, "They are just animals." and treat their suffering as if it were somehow different and not related to human suffering. I have had more moments when it clicked for people by introducing them to Charlotte and then comparing what animals go through to past human atrocities than any other form of activism. And this is especially true with kids who aren't usually speciesist enough to do the mental gymnastics required to deny the connections. In fact, I've met many kids who pointed these connections out without prompting. Not shocking considering how easy the connections are to spot.