If we want the animal exploitation to end:
"Putting aside the moral/spiritual aspects of violence [see e.g.: http://www.abolitionistapproach.com/a-comment-on-violence/ ], .. Institutional users engage in animal exploitation because the public demands it. Institutional users are, for the most part, indifferent to whether they are selling beef or bananas. They will put their capital wherever they’ll get the best return.
Most people regard animal use as “normal” in the same sense that breathing and drinking water are considered as “normal.” They demand animal products. If you destroy ten slaughterhouses today, as long as demand remains, ten more slaughterhouses will be built or ten existing ones will expand production (and probably make production more economically efficient). If you shut down a supplier of animals used for vivisection, and the public continues to support vivisection, which it clearly does, then another supplier will emerge. So as a purely practical matter, violence is a strategy that cannot work.
As long as animal use is regarded as normal and as not raising a fundamental moral question, nothing will ever change. But we are not going to get people to think about animal use through intimidation, fear, and acts of violence. Education, if it is to be effective, can never be violent; it can never seek to intimidate or make people fearful. It must open their hearts and their minds. The non-violent strategy is anything but passive; it involves our working actively, constantly, and creatively to shift a fundamental paradigm—the notion that animals are things, resources, property; that they are exclusively means to human ends."
Read more here: http://www.abolitionistapproach.com/on-violence/#.UWF3hcpEBKY