Without going deep and philosophical, I occasionally find the vegan argument a little light in terms of which living things it is OK to kill. I don’t pretend to have any high ground here. If it tastes good or is likely to hurt me, I’m OK with killing it. I’m not big on fox hunts, bull fighting, and similar spectacles of gratuitous killing. Bugs, meh!
That's why I prefer to refer to my veganism as an ideology rather than a philosophy. It's individual, and I don't think I ever shared with anyone my personal reasons. The only philosophy I can extract from this is that killing is never OK and I can't imagine any categorisation (species, intelligence level, etc.) which could justify it. I try to consider and minimise harm I incur on the natural world and non-human beings. Most animal-derived products are replaceable or prodigal, but I still have to feed my cats with meat (but I will research and potentially switch to in-vitro meat when available), visit the dentist (even if stomatology tests on animals) and I murdered the mealybugs.
I would prefer to invite ants or ladybirds to do the dirty job for me. Back at home they moved in every summer encouraged by some sugar treats - sugar and nettles are a good way of letting them know where they are and aren't welcome.