Banting and Best killed hundreds of dogs whilst they were trying to isolate insulin. And if they hadn't done that no T1 would be alive today. Or don't vegans mind if poor little fluffy wuffy animals come to harm if it's for medical purposes? Which means we think we're more important than the animals, if we can sacrifice their lives to save ours, which doesn't really fit with what I know of a strict vegan's ideals if they think that eating eggs exploits chickens unfairly. But I am not vegan or vegetarian and am never likely to be so please correct me if I have got that wrong.
When I was young animal experiments were a big issue, and I remember thinking even then that no I don't agree with rabbits etc being force fed lipsticks and so on just to make sure they aren't toxic, but experiments for medical reasons I can't argue with can I, because if it wasn't for them I wouldn't exist at all, because my mum wouldn't have lived long enough to have me