I think of it this way. From cannibals to vegans there is everything in between. Everyone draws the line in a different place as to what violence is necessary and what is not necessary.

We live in cities built on destroyed wildlife, drive cars that kill bugs etc. so there is no perfect non-violence.

For me eating meat is an unnecessary violence. I admire people who take non-violence to a higher level than I do but don't judge people who draw the line in a different place.