AfD representation in Bundestag is the sign of a healthy democracy

 - as is the presence of UKIP in Cardiff Bay. (The Welsh electoral system is not quite as proportional as it should be, but it is at least an advance on the Westminster first-past-the-post system which is an archaic rarity among civilised nations.)  Proportional representation allows voters supporting sizeable minority views to see their preferences expressed. Under FPTP, the failure to do so builds up frustrations and, perhaps more seriously, causes ambitious politicians with extreme views to enter established parties.

I note that, like UKIP in Wales, AfD has suffered early schisms.