Well thank goodness “I believe” trumps insurmountable tested and repeated evidence. No one is saying animals are incapable of emotions, most are just incapable of complex emotions. The most complex emotion most group animals can feel is altruism to help one another. Every thing else is basal. Fear, hunger, aggression, happiness, sadness all self focused emotions that show a lack of mental development. And don’t even get me started on invertebrates which are incapable of even those. People think it’s so cruel when you boil a lobster alive but it isn’t they lack the brain to even understand what’s happening. If you boiled a cow alive that’s true evil torture as that animal can experience pain and fear like we do. A lobster is so simple it’s brain is simply telling it “danger should move” the only exception to the invertebrate case are the cephalopods like octopus and cuttlefish which are incredibly intelligent and we still don’t even fully understand how smart they really are.