Pets and the Rain Forest

It has been claimed that one tenth of the world's palm kernel is fed to UK pets and livestock (http://www.guardian.co.uk/environment/2011/may/09/pet-food-asian-rainforest ). Palm kernel is a by-product of palm oil production and the planting of oil palms has a serious detrimental effect on Asian rainforest viability (and their contained organisms such as the orang-utan). So, are UK pets partially responsible for rainforest decline in Malaysia etc? I think that that is pushing it a bit. The pets are utilising a by-product and are not the primary reason why governments elect to replace rainforest habitat.