I agree pretty much with Lund. I want to try to minimise my adverse impact in the world. But I recognise I can't do everything. I'm a vegetarian, no longer a vegan since I got kids. I have chosen a career path based on not causing harm, which has made me significantly poorer financially than I could have been, but it's OK. It's my choice. I wear non-leather shoes, non-leather belts, and a non-leather biker jacket. My choice, and others are free to choose that or choose differently.
I wish I had the choice available of non-gelatin films, but the scale is such that there's probably no money in finding one, unless it turns out to be much cheaper (which is why so much cheese now uses vegetarian rennet; the turning point was not ethics, but profit, sadly). Similarly, in my other main hobby/lifestyle choice, cycling, animal products were used in the manufacture of tyres and inner tubes. I find that repellent, and I wish I had a choice, but, realistically, it isn't going to change significantly (unless it already has with advancing technology - I don't honestly know any more), or, at least, not for ethical considerations.
It's a bit sad that when some folk hear something challenging, they get ultra-defensive and start calling out vegans on the fallacy of perfection. I don't accept that, just because you can't be perfect and solve every problem that you just shouldn't try at all. We've all got something we can do. But hey, I make my choices. So do we all.