This thought occurred to me the other day. When you eat a vegetable, you have killed the entire plant (with a few exceptions). Whereas, when you eat a fruit, you haven't killed the original plant - you have only prevented it from reproducing. It's kind of like performing a plant-abortion. So, if our goal as vegans is to subsist without being cruel to other lifeforms, and killing them is being cruel, should we eat only fruits in order to avoid killing any plants?
Let's ignore the health effects of eating only fruit for the moment, and focus only on the ethical side. What are your thoughts on this?