Just like still animal sacrifice... Not only the followers of Vedas, every religion—animal is killed or sacrificed under certain religious rituals, in the lower stage. In the higher stage there is no such animal sacrifice. Just like this Kṛṣṇa consciousness movement, there is no ritualistic process as animal sacrifice. But the Vedas, they will include everyone. Suppose one is addicted to fish-eating or meat-eating. So the Vedas do not reject him also. He gives him direction that "You... All right, you can eat meat, but not you can start slaughterhouse. You can sacrifice one goat in the presence of goddess Kālī, and then you can eat." That means restriction. Goddess Kālī cannot be worshiped daily. So at least, he is forbidden to eat daily, meat. That is the idea.
Just like liquor shop is allowed by the government because there are drunkards. They must drink, but under restriction. You cannot keep liquor or wine more than the necessity. There is restriction. In India especially, there is very strict restriction. So similarly, the Vedic principle is to restrict sense gratification under certain rules and regulations. So the animal sacrifice is also restricted in that way.
But when people become too much animal-eaters and simply giving the evidence of Vedas, "In the Vedas it is sanctioned," but without caring for the ritualistic process, at that time Lord Buddha appeared. It is said about Lord Buddha that sadaya-hṛdaya-darśita-paśu-ghātam. The Lord appeared as Lord Buddha, being compassionate on the poor animals, unrestricted. So this animal-killing, no religion sanctions.