You think vegans are more likely to be surprised that predators eat other animals? I don't see the relationship there.
We have a really small wolf population here in Sweden, so small that we've had to fortify it on multiple occasions. Even so, you have these useless careless animal keepers that get really up in arms when a wolf (or a fox, even) goes and kills some of their animals, even though they often don't even have proper fencing set up.
It's ridiculous, because there are organisations that will help you fence your animals, there's monetary aid to be had for it too. Not keeping your animals safe is a choice, and I don't think it's fair to put the blame on the wild animals.
Even so, there will be animals lost to predators, and that's just part of the business. If you don't want to lose animals, don't get them.