I think the people saying Jainism are misunderstanding the question. Going out of one's way not to accidentally hurt a bug isn't really peaceful as much as it is gentle.
English
-
The only food they eat is vegetables and fruits. Also, they will only eat those if they have NATURALLY fallen off the tree/vine
-
But 'peaceful' isn't exactly the best word for that.
-
They're the most fitting for the definition of peaceful, ": quiet and calm : without noise, excitement, etc : not fighting a war: not involving violence or force."