yes, and no.
there are arguments that plants produce a chemical when they are
stressed and/or injured. so this can be like "pain".
however, there are also arguments that plants do not have nerves,
so they cannot feel it.
but, to be absolutely not cruel, one must not take life, not even
the inanimate plants. so, they should just eat mud, eggs, and wait
for fruits to drop down from the trees.
anyway, i dun really care who becomes a vegetarian, its their
choice and i cant care less. unless, theres a politician that says
everybody cant eat meat one day. 
