Harassment campaigns and the spread of Nazi ideology. Recruitment of fascists. That you think of Nazis as funny memeing autists shows that their attempts to make fascism look harmless is working.
Here is the thing. /pol/ anons exist for one purpose only. To cause harm to others. That is why they go to that board, that is why they do what they do. They gain amusement from the pain of minorities. They don't support Trump because they care about conservative politics. They do because they hope women get harmed (reproductive rights). They hope Muslims get killed. They hope more LGBT people commit suicide. because lulz.
There is nothing redeeming about /pol/. That entire community is a blight upon our society. It contributes nothing of worth. It only corrupts. And it should not be allowed to exist.