Why is the Christian Democratic Union (CDU) advocating for stricter border checks in Germany?

The CDU is advocating for stricter border checks primarily due to security concerns about uncontrolled immigration. According to the party's representative, accepting migrants with diverse cultural backgrounds without proper checks increases the risk of people who might pose danger to society. This stance has gained traction following several security incidents, including a recent car ramming attack in Munich that resulted in two fatalities, reportedly involving migrants. The party's popularity in polls has risen after such incidents, reflecting growing public concern about immigration security in Germany.