WS, all of the above and then some.
Our society, in general, loves to be the "savior"....especially if the thing we are saving is cute and lovable (notice any, save the horny toad campaigns lately?). Then there is the protest syndrome. I used to live near a hotbed of protest activity -- there were plenty of times when people would protest just to protest, they wouldn't even know what they were protesting against or for, they just liked the idea of being an "activist".
In general, we are a very wasteful and impractical society. We like to talk, a lot, about all the horrible things going on in the world. Take starving children, for example, we feel awful and think "something must be done" but in the next breath would protest using the surplus of horses as a food source to feed them.
There is this idea of being "better" than a lot of other cultures. Those cultures who eat animals such as dogs, guinea pigs and, gasp, horses. Cultures where that is acceptable are looked down upon by many of the anti-slaughter folk as being backward or just not knowing better (aka not being as enlightened as the all-might anti-slaughter person).
I think ultimately I have more respect for those who object to the consumption of all flesh, vs those who want to pick and choose which are okay to eat and which are deserving of being saved. At least the former is not a hypocrite.
I have no issue with someone not wanting to eat horse meat. Personally, I don't think I want to -- I do have an issue with someone thinking they have the right to tell me, or the next person on the street, what I can/can't eat.