I will answer that: no it shouldn't. You can have a certain level of engagement even when you strongly disagree with another country. Showing aggressive behaviour, specially taking into account the history of agression and colonisation by the West as recently as 50 years ago, will not do anything at all to make life better to the victims of Chinese prosecution. By engaging with the Chinese, the EU may at least have some leverage to politely request that the Chinese , as sovereign people, start displaying a little more respect to other cultures within their own borders.