Comment by ted_bunny

And if you can't do that, it's not all or nothing. It's not about keeping your soul pure.

Go vegan on weekdays. Or weekends. Or one meal a day. Or do vegetarian instead of vegan.

There are a lot of ways to do a nonzero amount of good, and you may inspire others to do so. And this partial commitment allows you to do so without any adjustment to your lifestyle. You will not suffer a B12 or iron deficiency or whatever else you're worried about. You don't have to eat weird foods you're grossed out by.