This picture is just mistaken - because plant cultivation destroys a lot of small animals. Even if you were for some reason only interested in the lives of mice etc. and assigned literally zero value to cow lives, it takes more plants to sustain a cow until it can be turned into food than to get an equivalent amount of food directly from soybeans or something. It may be that, say, turning a herd of goats loose on uncultivated land and then eating the goats is very cheap in mouse lives, but this isn't how meat is normally procured in the developed world. Cows are fed things like soybeans and corn that humans could be eating directly, or that are produced in place of and using the resources that could have been directed towards producing other plants humans could be eating directly.