We don't know what consciousness requires to manifest (nor really even what it is), so ruling out plants having any level of consciousness just because they don't have animal neurons is an opinion, not a fact. There are electrochemical signals happening within them, so it is entirely possible they perform similar functions to an animal nervous system without having any neurons.
Many animal behaviours could also be argued to be reactive. Particularly, if we reduce learning behaviours in plants to mere reactions, then by the same logic it could be argued that learning behaviours in simple animals (like, say, lobsters, which have 1/10th the number of neurons a cockroach does) are also just complex reactions.
I'm not saying this because I really believe plants are conscious or sentient (i.e. capable of sensing in a way analogous to humans or complex animals like, say, dogs or cows). I'm saying it to illustrate how with our present-day knowledge any moral line we draw is going to ultimately be arbitrary. Excluding complex mammals like cows or pigs from our diets for being too sentient is easy, but the simpler the animal becomes the harder it gets to create objective criteria that excludes, say, bugs, but doesn't exclude any plants.
then being vegan is still the more moral option since the amount of plants that need to be "murdered" to feed an animal until it's ready for slaughter is orders of magnitude higher than the nutritional value we get out of the animal when we murder it.
Correct, and this argument is the one you want to use with the average Lemmy user. Not because of the moral cost of killing plants or animals, but because of the environmental cost. Most Lemmy users already agree that climate change is a problem, so this argument is an easier sell to them. It is what made me reduce my consumption of meat.
