I don't really like the idea, no, but I don't have a very well developed opinion on this issue. I do, at least, think society has better uses for horses than eating them. I don't think you could say the same about cows or chickens or fish
A great many people in India would strongly disagree with you on cows
I don't count superstition as legitimate reason for anything.
How is that any more a "superstition" than, say, the belief that the bread and wine used for Communion become the body and blood of Jesus? Both things are religious beliefs, not matters of fact.