As for your point of plants not feeling any pain because of the absence of an elaborate nervous system, I would like to ask you if you would consider it okay to kill a lobotomised animal for food because it can feel no pain ? I would like to present the following facts about plants:
3.1 When one tree is attacked by pests, it emits chemical signals to nieghbouring trees, encouraging them to produce chemical deterrents to that pest, ensuring their own safety.
3.2 the level of sophistication in this process is made all the more remarkable by the fact that the these ‘signals’ encourage production of substances tailored to specific pests!
3.3 An example of this would be the lima bean. When attacked by spider mites, the plant releases a chemical attractant for other types of mite, which prey on the attackers. Some plants help others, as in the case of cabbages, which release foul smelling isothiocyanates, discouraging aphids from attacking neighbouring plants like broad beans.
3.4 Research has also shown that plants actually ‘time’ the release of defensive chemicals, to correspond with the hours of the day when predators are most active
3.5 Sensitive to "touch" - Research has shown that in 17 different families of plant, over 1,000 varieties are very sensitive to touch – possibly an ancient inheritance from bacteria, which are known to be the ancestors of all plant life, responding to stimuli with minute electrical impulses.
3.6 The most amazing thing about plants is their ability to ‘see’. So sensitive to light are they that even the colour of their surroundings can affect their growth and taste!
The bottom-line is, plants are not as "without-feelings" as many of us believe. They are far more alive and so "see", "feel", "taste" things in their own way. In that case, cutting off fruits or taking out the whole plant does constitute an act of violence in my opinion and is morally as unacceptable to me as killing an animal.