In the wild, the majority of animals are eaten alive, usually as babies. Also, nature is incredibly wasteful: I think this every time I find a dead baby bird (pushed out of the nest) in my courtyard. And human dentition and the human digestive tract are clearly omnivore. Arguments about what is 'natural' can safely be dismissed.
Arguments about what is moral are another matter. Deliberately inflicting suffering is not, as far as I am concerned, moral. Nor am I alone: cf recent EU regulations on keeping battery hens. I always check carefully where pork comes from too: there's far too much battery pig-farming in France (mostly in Brittany), and I will not eat beef treated with hormones. Nor will most off the civilized world, which is why you never see cheap, exported US beef. That's NOT an attack on the USA, but on certain powerful lobbying groups who act on behalf of the meat industry.
Buying 'bio' ('certified organic') food is something of an extravagance, that can be afforded only by the well-to-do, and a lot of 'bio' food is a con job. But there are still times when I prefer 'bio' -- mostly on moral grounds. occasionally on health grounds, and, in some cases, because it tastes better.
This is a moral choice. I do not however have a moral problem with most of the food I eat, including meat, though I have a bit more of a problem with fish, which are seldom killed quickly and humanely. The gelatine in film is pretty low on the list of things I feel guilty about. As others have said, there are vast grey areas in most of the things that most of us do. The only people who can tell us what we will put up with, and what we won't, are ourselves.
'Ourselves' should be as well informed as possible, but equally, there's a difference between information and preaching, especially when the preacher uses 'facts' that are not, shall we say, universally accepted even by those who try to keep an open mind.
Cheers,
R.