The CDU moved more into a more left direction under Merkel, so there are politicians who will try to capture the more right-wing voters who don't feel themself

The CDU moved more into a more left direction under Merkel, so there are politicians who will try to capture the more right-wing voters who don't feel themself represented by the CDU anymore. Voila - AfD is born. As a German I don't like the AfD but really don't worry about it.