Some people think that they can cure cancer, so illegal traders make fortunes off of every part of the Pangolins. They are pretty high in demand in certain parts of the world. Also, they're really easy to catch in the wild because their defense tactics are to roll up super tight into a ball until they think it's okay to release themselves, and usually by that point they're held in tight cages with a bunch of other Pangolins, awaiting to be sold off to dealers who poach them alive and make tonics from their blood.
Since they are endangered, it makes it quite popular for places to serve Pangolin fetuses as delicacies in areas such as East Asia because it signifies a person's status to be a sign of being above the law to "afford such a meal."
Guangdong chef interviewed last year in the Beijing Science and Technology Daily described how to prepare a Pangolin: 'We keep them alive in cages until the customer makes an order. Then we hammer them unconscious, cut their throats and drain the blood. It is a slow death. We then boil them to remove the scales. We cut the meat into small pieces and use it to make a number of dishes, including braised meat and soup. Usually the customers take the blood home with them afterwards.'"
If anyone cares and wants to help with the prevention of poaching, although it might be quite minuscule, you can start off by just spreading the word!