Clarification for Sahih al Bukhari 2476 about killing pigs

> Allah's Messenger (ﷺ) said, "The Hour will not be established until > the son of Mary (i.e. Jesus) descends amongst you as a just ruler, he > will break the cross, **kill the pigs**, and abolish the Jizya tax. Money > will be in abundance so that nobody will accept it (as charitable > gifts). Can someone explain the bit about killing pigs? Why is that the case? I have heard explanations that pigs are filth except that there are a lot of other animals that are filth. What's so specific about pigs? I also understand, that Allah created all animals to be treated with kindness. Does this references that pigs don't fit that category? That they are impure and should be exterminated. Or am I missing something else.