Well the problem is that animal use is so ingrained into most cultures that it's almost impossible to never ever use animals. Supposedly there is something from horses in car tires and in computer monitors. My philosophy as a vegan is that I try my absolute best to avoid financially supporting animal suffering. I constantly add new things to my memory list to not eat or use, and when those get easy I go online, find new ones and add more. It's not about being perfect, it's about trying. ^^
At the end of the day I think animals are in sprinkles and tires and computer monitors because we live in a culture that eats and uses animals all the time. If we lived in a society where 50% of people were vegan, it wouldn't be cost effective to put insects in sprinkles so they'd just stop. If people didn't buy cow meat then the price of milk would go up and no one would buy milk, it's this big circle of causes. The only way to get there is to try and inspire cultural change, or at least that's what I believe and try to do.