''We no longer enslave animals for food purposes'' Star Trek

STAR TREK: The Next Generation 
Season 1 
'Lonely Among Us'

''We no longer enslave animals for food purposes'' William Riker / No. 1 (played  by Jonathan Frakes)

Gene Roddenberry, creator of Star Trek, was a vegetarian and I believe he was right in portraying the consumption of meat linked to aggression and violence.
No matter if you have ever watched an episode of Star Trek or not, you surely know who Vulcans are. According to the show (STAR TREK : Enterprise - which was filmed 2001-2005, but is a prequel to ST : The Original Series) Vulcans are naturally vegans, as they are civilized, diplomatic and care a great deal for peace, while the logical code they follow seeks to embrace all creatures / life forms. As the show proceeds (from STAR TREK: The Original Series to ST : The Next Generation) also humans overcome the oppression of animals and by this become more efficient, modern and civilized than they had been. 

So Gene Roddenberry's message through STAR TREK might be: If we want to overcome war, oppression and discrimination the path we should take involves to stop the enslavement of animals. It will free our minds, make our species healthier and happier through embracing the truth and stop being responsible for so much suffering. Then and only then are we able to become civilized in a way that we claim we already are...

And coming back to Vulcans: Veganism simply is the most logical choice.